message: Add list of supported browsers to README.
  Mention that IE 11 is a TODO.
diff: @@ -247,3 +247,14 @@ Update existing frontend dependencies:
  ```
  yarn upgrade <package@version>
  ```
  +
  +
  +#### Supported Browsers
  +
  +We support the latest versions of the following browsers:
  +
  +- Edge
  +- Chrome
  +- Safari
  +- Firefox
  +- TODO: IE 11. Needs polyfills. Also, IE 11 can't open more than 6 websockets.
  