retro-board

This is a Retrospective Idea board, powering retrospected.com.

 

       

This project is both an actual product, and also a technology demo using the latest and greatest JavaScript/TypeScript libraries of the month.

It features the following technologies:

• React 18
• React Hooks
• React Router 6
• TypeScript 4.6
• Recoil.js, as the global state management library
• Socket IO
• Webpack 5 (See older versions for Webpack 1, 2 and 3)
• Create React App 5
• MUI 5 for our components (previously known as Material-UI)
• Material UI design
• Emotion
• Multilingual / Internationalization
• Postgres
• Node 16
• Passport for seamless OAuth authentication with:
  • Google
  • Twitter
  • GitHub
  • Slack
  • Microsoft
  • Okta
• Giphy because adding a bit of fun to your retro can't hurt!
• React Beautiful DND to allow re-ordering and grouping by drag-and-drop
• Jest for Unit Testing
• React Testing Library, for Integration Tests
• Yarn, replacing NPM
• Docker, for easy deployment
• Kubernetes, to scale Retrospected for its 10M+ users (not)
• GitHub Actions, for Continuous Integration and Deployment (CI/CD)
• Multi-Architecture, for automatic compatibility with ARM-based servers
• Stripe, for our payment solution
• Docusaurus, for our documentation

Previous versions, up to v1.0.1 featured the following libraries:

• Redux
• CSS Modules
• redux-saga
• reselect
• ESLint for JS and JSX

Documentation 📖

You can browse the documentation here.

Using Retrospected 🚀

You have two ways of running Retrospected:

• Using the public version, at www.retrospected.com
• Host Retrospected on your premises

Want to host Retrospected on your premises? 🖥

You can start an instance of Retrospected in 5 minutes by following the quick-start guide.

This will run a demo version, which you can turn into a fully licenced version by purchasing a Self Hosted licence.

Versions History

Version 4.16.1

• Fixed a bug where sessions could not be deleted when there was any chat messages (👏 Thanks Florin Bicher for the report)
• Update icon
• Better Slack integration

Version 4.16.0

• Complete overhaul of the translations. Switching to i18next. Translated all languages using Machine Learning (via Crowdin)
• Added translations for the Ukrainian language, and a link to provide help for Ukraine 🇺🇦
• Fix the empty file download when logging using Google OAuth
• Upgrade the documentation to the latest version of Docusaurus
• Add more integration tests, covering password accounts and account deletion
• Added the language picker in the account page, in addition to the side panel

Version 4.15.0

• Self-Hosting: Improve Admin dashboard for Self-Hosted, allowing the admin to add and delete users
• Self-Hosting: Add an option to allow self-signed certificates for the SMTP server, for sending emails
• Fix GDPR account deletion, which did not work when the user had any chat messages
• Upgrade React typings to v18
• Upgrade all frontend dependencies

Version 4.14.1 (hotfix)

• Remove CSRF code, causing random issues

Version 4.14.0

• Upgrade to React 18
• Replace icons by emoji for columns headers (fully customisable)
• Self-Hosting: Adding SMTP support for self-hosting, in addition to SendGrid. 👏 Thanks @dayByte for the idea. (#365).
• Self-Hosting: Simplification of SendGrid setup, by removing the need of creating email templates. They are now hardcoded.
• Self-Hosting: Improving email templates
• Improving Text and Markdown exports on Summary Mode. 👏 Thanks Jakob J for the idea. (#384).

Version 4.13.0

• Adding the option of paying for Retrospected Pro annually, getting one month free in the process
• Update prices, especially for USD
• Make the integration tests less brittle by using specific attributes
• Upgrade (finally!) to React-Router v6.
• Self-Hosting: Allow an administrator to disable Anonymous Logins (to force users to use regular accounts).

Version 4.12.1 (hotfix)

• Adding users to a Pro Team subscription wasn't working anymore, because of Webpack 5.

Version 4.12.0

• Changing naming convention for the database. All fields and tables are now snake_case.
• Simplified the configuration of TypeORM, removed the generation of ormconfig.json.
• Added Integration tests using Cypress to catch Docker-specific errors and have some basic smoke tests.
• Upgrade to react-scripts (Create React App) 5.0.0
• Upgrade jQuery (for the marketing / home page), to 3.6.0 for security reasons
• ⏫ Upgrading dependencies

Version 4.11.5 (hotfix)

• Making secure cookies an optional setting, as they won't work unless it is hosted on HTTPS.

Version 4.11.4 (hotfix)

• Fixing a migration issue when installing from scratch

Version 4.11.3 (hotfix)

• Adding hardcoded licence for a specific self-hosted client.

Version 4.11.2 (hotfix)

• Encrypt chat messages on encrypted sessions
• Ensure long chat messages are displayed across multiple lines

Version 4.11.1 (hotfix)

• Reverting the migration from react-scripts (create-react-app) 5.0.0 to 4.0.3. The new version includes Webpack 5, which causes issues with polyfills. The issue should be fixed in 5.0.1 which is not available yet.

Version 4.11.0

• Adding a chat functionality. Send messages to your colleagues without having to use Slack or any other external tool!
• Add the author (when the "Show Author" option is enabled) in the summary panel. 👏 Thanks @hmlkao for the idea. (#336).
• Deprecate Yarn Workspaces to limit dependency sharing
• ⏫ Upgrade most dependencies for security reasons
• Upgrade Nginx image to fix security issues
• Force secure cookies on production
• Add Trivy vulnerability scanner on CI

Version 4.10.0

• Add better GDPR compliance, with the right to be forgotten: allows a user to delete all of their data
• Add the ability for users to signal if they are done with their posts, to help the moderator
• ⏫ Upgrading dependencies

Version 4.9.0

• Brand new documentation website.
• Migrate all docker images from antoinejaussoin/retro-board-* to retrospected/*.
• Allowing Self-Hosted instances to use SendGrid for email recovery
• 🐛 The Unlimited subscription domain check was not accepting valid domains such as .ventures or .agency.

Version 4.8.0

• Upgrade to MUI 5.0 (ex Material UI)
• Migration from Styled Components to Emotion (for compatibility reasons with MUI)
• Add hard-coded self-hosting licence mechanism for companies with restricted internet access
• ⏫ Upgrading dependencies

Version 4.7.2

• Replacing Google OAuth passport library, to try and reduce Google OAuth errors on production
• Added a script to make bumping versions easier
• ⏫ Upgrading dependencies

Version 4.7.1 (hotfix)

• 🐛 Fixed a bug highlighted by Sentry, where anonymous account without a password would trigger an exception.

Version 4.7.0

• Account Federation: all accounts with the same email address are now a unique account (sharing sessions, etc.). If you owned multiple accounts with the same email address (for instance one via Google OAuth and another via GitHub), they will be merged into a single account.
• CSRF protection
• Significant performance improvements on retrieving past sessions (10x to 100x)
• Add the ability for anonymous users to delete the boards they created under certain conditions (#229).
• ⏫ Upgrading dependencies

Version 4.6.1

• Fixing a typo. 👏 Thanks Chad S.! (#296)

Version 4.6.0

• Support OKTA for authentication
• Speeding up the migration on production (using transpiled JavaScript instead of TypeScript via ts-node)
• Making email checks for Pro Team subscriptions case-insensitive. 👏 Thanks Nico! (#287)

Version 4.5.0

• Adding the ability to self-host Retrospected in a very easy way.
• Change the default order for new posts. New posts are now (by default) appearing at the top of the column. 👏 Thanks @konrad44 for the idea. (#272)
• Upgrade containers from Node 15 to Node 16
• Spelling fixes on home page cards
• ⏫ Upgrading dependencies

Version 4.4.0

• 🐛 Fixed a bug where the export button on the summary page was hidden by the participants bar. 👏 Thanks @hieuwu for pointing this out. (#262)
• Added the ability to collapse groups (hidding their content). 👏 Thanks to Sultan S. for the suggestion. (#263)
• Added the possibility for deployements where the backend has a single instance (no replicas) to not use Redis with Socket.IO.
• Fixed a bug that would trigger the rate limiting when adding posts to groups, triggering a disconnection
• ⏫ Upgrading dependencies

Version 4.3.0

• Add the ability to restrict the number of posts per user on a given session (as an option).
• Rename some folders in the repository to more sensible names
• Prevent the UI from sending more than 100 Sentry errors, to avoid spamming Sentry.

Version 4.2.2

• Add a better check for self-hosted licences.
• ⏫ Upgrading dependencies

Version 4.2.1

• Search now also works with the author's name, if the author is displayed. 👏 Thanks @ayxos for pointing this out. (#202)
• Replacing the reducer logic with Recoil for global state management.
• Adding the possibility of creating a post by clicking on the 'return' icon (⮐) instead of hitting "Enter". 👏 Thanks to @do606 for pointing out that Enter doesn't always seem to work (#246).
• Re-adding the ability of creating a post by hitting Enter on a numeric pad. 👏 Thanks again to @do606 for that.
• ⏫ Upgrading dependencies

Version 4.2.0

• Add a page explaining how local encryption works
• Re-introducing rate limiting, both for the REST API and the Websocket connections, in Node and Nginx
• Reduce the quantity of data sent over Websockets (for instance, only sending post ID instead of whole post when voting)
• Reduce the number of SQL queries on the backend, simplifying the backend logic
• Return an error message to the UI if a Websocket message doesn't succeed
• Improve websocket reconnection logic
• Upgrading to Socket.IO 4.0
• ⏫ Upgrading dependencies
• 🐛 The participants footer was sometimes hidden by the blur overlay of a post. 👏 Thanks @Pajinell for pointing this out. (#240)
• 👏 Thanks to @cindyccook for pointing out reliability issues (#232).

Version 4.1.4 (hotfix)

• 🐛 Language loading issues

Version 4.1.3 (hotfix)

• 🐛 New users were wrongly added with a quota of 0

Version 4.1.2 (hotfix)

• 🐛 Fixed a bug with local storage

Version 4.1.1 (hotfix)

• 🐛 Fixed a bug where Slack OAuth was disabled

Version 4.1.0

• Adding a 30-day trial
• Adding Microsoft OAuth 2.0
• Code splitting: all pages have their own bundle now, for a faster first-load experience
• Removing all import React from 'react'; imports, as they are now redundant.
• Introducing Recoil.js (as an experiment)
• Limiting the number of posts to 50 for free accounts

Version 4.0.5

• 🐛 Fixed a bug whereby adding multiple cards on a single group wouldn't work correctly (only the first card would be persisted in that group). 👏 Thanks to Daniel N. for reporting this by email.

Version 4.0.4

• 🐛 Fixed a bug where adding an action was changing ownership of the post to the person adding the action. 👏 Thanks @botactic! (#209)
• Use TypeORM transactions for every database interactions, fixing some random races conditions.
• Improving multi-arch support
• Improving API calls and Sentry

Version 4.0.3

• 🐛 Fixed a bug where groups couldn't be deleted if you didn't create them in the first place.

Version 4.0.2

• 🚨 Emergency fix, for a serious bug that made it seem like a lot of people were participant to your session. This was never the case, it was displaying every non-logged in people as spectators to your session erroneously.

Version 4.0.1

• Added the list of participants to the bottom of the screen 🧑‍💻
• Added a notification on connection or disconnection of participants 🟢 🔴
• Update OAuth photo on every login
• Replaced GitHub OAuth library by a more recent version, to avoid deprecated GitHub API.
• 🐛 Fixed a bug where the author of a new session wasn't registered as a participant
• 🐛 Fixed a bug where online participants were not showing

Version 4.0.0

• [⭐️ Pro Feature] Encrypted Sessions: full client-side encryption of your data
• [⭐️ Pro Feature] Private Sessions: ensure only your colleagues can access your session
• Full support for password-based accounts
• Slack Authentication (OAuth) 🔑
• Replacing Travis by GitHub Actions for CI and Deployment 🚀
• New Freemium model
• Adding dynamic HTML title for better browser experience. 👏 Thanks @sam-pires! (#167)
• Adding a search functionality to find the needle in your haystack. 👏 Thanks @ayxos for the suggestion! (#171)
• Improving the Post component to hide up/down votes when they are disabled. Also got rid of the "flippable" panel, all actions are now visible directly. 👏 Thanks @Xyaren for pointing this out. (#150)
• Automatic Backend code linting, and CI linting
• ⏫ Upgrade to TypeScript 4
• ⏫ Upgrade to React 17
• ⏫ Upgrade to Create-React-App 4
• ⏫ Upgrade to Socket.IO 3.0
• 👏 A big thanks to @wooddar for beta-testing and his great feedback!

Version 3.2.3

• Fixed a bug with GitHub authentication, where the display name was not set (#165). 👏 Thanks @hieuwu!

Version 3.2.2

• 🐛 Fixed a bug where any user editing the name of the session would become owner of the session.

Version 3.2.1

• 🐛 Fixed a serious bug under Firefox, where users could not see the content of the post (#154, #148). 👏 Thanks to all people who reported this (@Xyaren, @dallasgutauckis, @courtney-thwaites).

Version 3.2.0

• 🇮🇹 Improved Italian translation (👏 Thanks @mventuri)
• Ability to delete sessions, if you are authenticated and you are the author of the session (#116)
• Allow changing the default language for new users via environement variables (#135)
• Allow a moderator to blur cards written by others, to keep everything hidden until the end of the retrospective (#100)
• Complete redesign of the Custom Session settings modal
• Ability to modify session settings once the game has started. This is only available to the session moderator (author) (#92).
• Ability to display past sessions for Anonymous users. This is limited to viewing past sessions on the same browser, any login to a different browser will create a different anonymous account, for safety reasons (#112).
• ⏫ Dependencies update

Version 3.1.1

• 🇳🇱 Improved Dutch translation (👏 Thanks @jghaanstra)
• ⏫ Dependencies update

Version 3.1.0

• Multi-architecture support! Hello Rasperry Pi 🍇 🎉! And Apple Silicon 🍎
• Docker images are automatically compatible with ARM (arm64, v6, v7, v8)

Version 3.0.3

• 🐛 Bug fix: Issue 121, Issue 123
• ⏫ Dependencies update

Version 3.0.2

• Adding privacy policy, terms and conditions, GDPR support
• 🐛 Fix various bugs reported by Sentry

Version 3.0.1

• Improvements on the landing page experience
• SEO

Version 3.0.0

• Brand new landing page, and much improved look and feel 🎉
• Authentication using your favourite social media account:
  • GitHub
  • Google
  • Twitter
  • ...more coming!
• Ability to re-order posts by drag-and-drop 🚀
• Ability to group posts together
• Save your custom session settings as a default template
• Giphy support 😃
• Improved homepage dashboard 📈

Version 2.2.4

• 🇷🇺 Russian Translation improvements (👏 Thanks @regmagik)
• Fixing logout button translation
• Adding fetch polyfill for IE
• ⏫ Upgrading dependencies

Version 2.2.3

• 🇮🇹 Italian Translation (👏 Thanks @mventuri)
• Re-enabling source maps for Sentry
• ⏫ Upgrading dependencies

Version 2.2.2

• Allowing a user to disable voting (by setting the max number of votes to 0) (👏 Thanks @imranismail)
• Fixing an issue with Docker and Yarn's installation
• ⏫ Upgrading dependencies

Version 2.2.1

• Adding Sentry support for the backend
• Making Google Analytics and Sentry configurable at run-time (as in Docker run-time)
• Adding Copy to clipboard compatibility for more browsers
• Preventing the app from crashing when cookies are disabled on Firefox
• Handling disconnections better by not reconnecting automatically and displaying a message instead.

Version 2.2.0

• Kubernetes configs. Deploy Retrospected to the cloud! ☁️ 🚀 ☸️
• Making the backend scalable by making SocketIO use Redis to communicate between instances. This is disabled by default and is only useful for Kubernetes deployments.
• The backend hostname is now configurable on the nginx config on the frontend.
• Replaced all occurences of withRouter by useHistory and useParams
• Added CI/CD support with Travis
• Auto-deployment of Docker images to Docker Hub
• Changing the UX related to Summary Mode
• Added the ability to copy the content of the session in the clipboard, both in Markdown format and Rich Text
• Added Error Boundaries to improve the user experience if the app crashes
• Added support for Sentry.io (error logging)
• Fixed an issue where multiline content was not displayed properly for anyone except the author
• Fixed an issue where a post couldn't be deleted if it had votes attached to it
• Issue 56 - Fixed an issue where new users who were not persisted yet couldn't vote (👏 Thanks @dkistner)

Version 2.1.4

• 🇩🇪 German Translation (👏 Thanks @PaulBrandt)
• 🐛 Bugfix: First post was sometimes not saved on regular sessions

Version 2.1.3

• IE fix: the previous polyfill didn't quite work with IE9 to IE11.

Version 2.1.2

• Older browser support (IE11, somewhat works with IE10 and IE9).
• Adding an "outdated browser" warning
• Adding a remaining votes counter when using a maximum number of votes rule.
• Changing how Editable Labels work: they now only fire onChange on blur or Enter, minimizing the amount of traffic over the socket
• Removing the REACT_APP_DEBUG environment variable (using NODE_ENV instead).
• Adding a loading spinner while loading the game now that we can't predict which number of columns are going to appear on screen.
• Making sure index.html is not cached by Nginx on production
• Removing .map files on production

Version 2.1.1

• MS Windows support/fixes (👏 Thanks @srraf).
• PR-48 - Fixed a word-wrapping issue when we have only one (long) post (👏 Thanks @manicmaniac).
• Fixes a possible race-condition issue with "vote" syncing.

Version 2.1.0

• Adding full customisation of columns and rules:
  • You can now create a board with 1 to 5 columns
  • You can allow a user to vote for his own posts
  • You can allow multiple votes on the same post
  • You can limit the number of up and down votes
  • You can choose to display the name of the author, and the name of the persons who vote
• Your language selection is now remembered between sessions
• Various UI fixes:
  • Login modal improvements
  • Editable label improvements
• Various Docker improvements
• ⏫ Upgraded dependencies
• 👏 Special thanks to @jesusabp, @zalexki and @jfritz for their inputs and ideas!

Version 2.0.4

• ⏫ Upgraded dependencies
• Allows multi-line posts and comments (use the shift key to add a new line) (👏 Thanks @andyk314)
• Re-adding Hot Reload, which now works great with TypeScript and Create-React-App.

Version 2.0.3

• ⏫ Upgraded dependencies
• Fixed an issue with Docker eating too much space with its unlimited log size. Log is now limited to 50mb.

Version 2.0.2

• Added an "Action" field on each Post: this allows the user to define a list of actions that need doing in the next sprint, and allows displaying this list in the Summary Mode.
• 🐛 Bugfix: In certain conditions, some race-condition would store a post with a null session ID (so the post was lost forever).
• 🐛 Bugfix: Disabled the Web Worker, as it's not working properly when loading a game directly (and not loading the homepage).

Version 2.0.1

• Adding support for Postgres migrations
• Adding created/updated fields on Post and Session
• 🐛 Bugfix: Summary mode wasn't ordered by votes anymore. (👏 Thanks @cindyccook)

Version 2.0.0

• Complete rewrite
• TypeScript
• React Hooks
• @testing-library/react
• New component library (MaterialUI)
• Docker-friendly

Version 1.0.1

• 🇯🇵 Japanese Translation (👏 Thanks @sat0yu)
• Simplified the ESLint configuration
• Introducing Prettier (yarn format)
• ⏫ Upgrading to Babel 7

Version 1.0.0

• React 16
• Webpack 4 (for previous versions of webpack, see below)
• Using @bionikspoon/react-toolbox instead of the original react-toolbox, as the project is no longer maintained and doesn't work with React 16.
• ⏫ Upgraded all the other dependencies, everything should be up-to-date
• Improved the home screen

Version 0.10.0

• Webpack 3 (for Webpack 2, look at version 0.9.0)
• Converting entire project to 2-space indentation
• ⏫ Upgrade other dependencies
• 🇵🇱 Polish Translation (👏 Thanks @olaf-cichocki)
• 🇦🇪 Arabic Translation (👏 Thanks @FrenchTechLead)
• Improved the loading screen

Version 0.9.0

• Webpack 2 (for Webpack 1, look at version 0.8.1 and older)
• React 15.5 (which needs the new prop-types module, among other things)
• React Router 4 (completely different way of doing the routing)
• Move the structure of the project to a modular structure
• ⏫ Upgraded all the other dependencies to the latest versions, except react-toolbox

Version 0.8.1

• Hotfix (ESLint errors on production build)

Version 0.8.0

• Using redux-saga-testing to test sagas
• 🇹🇼🇨🇳 Chinese (Traditional and Simplified) Translation (👏 Thanks @aqutw)
• Using Yarn
• ⏫ Updating dependencies
• Fixing some Spanish translation mistakes (👏 Thanks @MrPolymath)
• 🐛 Fixed a bug where the Vote buttons would allow a user to vote multiple times (on the UI only)

Version 0.7.0

• Good test coverage, using Jest
• 🇷🇺 Russian Translation (👏 Thanks @vectart)
• 🇪🇸 Spanish Translation (👏 Thanks @andresin87)
• Replacing PNG flags by SVG/CSS versions
• Using react-hot-loader 3.0.0 (beta2) for Hot reloading
• Fixing a few mobile/responsive issues

Version 0.6.1

• React-toolbox 1.0.0
• Debugging instructions

Version 0.6.0

• Added the ability to edit existing posts inline (posts you wrote)
• Adding a new Invite button to simplify and explain how to invite other people
• Removing the snackbar
• Removing ES7 decorators, as they are not standard yet
• Removing hash on CSS and JS on production (not necessary since we have the version number)

Version 0.5.2

• 🐛 Fixed a bug on the anti-spam when if using a proxy (nginx for instance), the wrong ip was used
• 🐛 Fixed a bug where the linting would fail if the default configuration was used (👏 Thanks @veselignome)

Version 0.5.1

• Full support of ESLint, based on AirBnB rules
• Adding an anti-spam for SocketIO, because someone is having fun crashing my server (thanks!)

Version 0.5.0

• Adding the possibility to join a previously joined session quickly (👏 Thanks @Sonaryr)
• Performance improvement on title edit (Also thanks to @Sonaryr 👏)
• New Logo!
• Added Favicons

Version 0.4.1

• Updated the screenshot on the readme
• package.json version updated properly this time

Version 0.4.0

• Improved the "Create Session" page, allows a user to create a session with a custom name
• Ability to edit that session name in real-time (by anyone)
• Added a "Summary Mode": this gives a summary of a current session, allowing a user to copy-paste the entire content easily
• New shorter session IDs
• New look-and-feel (new colours)
• Using reselect to create memoized selectors
• Improving performance by using shouldComponentUpdate via a custom base Component
• Updated to the brand new React 15
• Improving Windows support by allowing Windows users to use the same commands as *nix users
• 🇳🇱 Internationalisation: added Dutch to the list of supported languages (👏 Thanks @Sonaryr)

Version 0.3.0

• Adding support for more robust databases (NeDB, by default, in process, and MongoDB)
• Change to the Like / Unlike logic: a user can now only vote once, and not for his own posts
• Change to the Like / Unlike logic: like and unlikes counts are separated
• Adding ES7 decorators, more readable than the previous curry-ed functions
• Better support for Windows
• 🇧🇷 Internationalisation: added Brazilian Portuguese to the list of supported languages (👏 Thanks @renancouto)

Version 0.2.0

• Using redux-saga instead of redux-thunk
• Persistence: Simple persistence to disk (no database needed)
• Support for Google Analytics (with precise events monitoring)
• Ability to logout, and to leave a session
• Improve the reliability of the clients list (currently connected users)
• Fix issues when the web fonts can't load (firewall blocking for example)
• 🇬🇧 🇫🇷 🇭🇺 Internationalisation: support for English, French and Hungarian (👏 Thanks @iaretiga)

Version 0.1.1

• Minor visual tweaks
• Better console logs, server side
• Big clean up of un-used files and old libs

Version 0.1.0

• First production version
• Basic functionalities are there and working
• Login
• Creating a session
• Joining a session
• Adding new posts
• Like / Unlike posts
• Ability to delete our own posts
• List of connected users
• No persistence (yet)

Frequently Asked Questions

What if I want to name my session so I can remember easily how to come back to it?

You can actually change the session ID in the URL with anything you like: for example www.retrospected.com/game/hello_world

Try not to take a too common name though, to avoid anyone else finding your session by chance.

Thanks 👏

Many thanks to the following contributors who helped translating the app:

• Hungarian: @iaretiga
• Portuguese (Brazilian): @renancouto
• Dutch: @Sonaryr, @jghaanstra
• Russian: @vectart, @regmagik
• Spanish: @andresin87
• Chinese: @aqutw
• Polish: @olaf-cichocki
• Arabic: @FrenchTechLead
• Japanese: @sat0yu
• German: @PaulBrandt
• Italian: @mventuri

If you are a native speaker of another language, please don't hesitate to make a pull request to add a translation.

Special thanks to @andresin87 for pointing the flag-icons package to me, it replaces the PNG flags in a neater way.

Another special thanks to Browserstack, as they allow me to test this project in other browsers.

Please make your PRs from the develop branch, not master.