React 17 support

[catamphetamine]

React 17 removes componentWillMount and context API.
I can see your router uses both.
I'm creating this issue as a source of info on the status of React 17 support for those who're interested.
If you will be planning to release a React 17 compatible version when the time comes you can drop a comment here.
There are two polyfills for non-breaking changes:
https://github.com/reactjs/react-lifecycles-compat
https://github.com/jamiebuilds/create-react-context
But the second polyfill only supports React 16

[taion]

I do plan on switching to those APIs. At the moment for backward-compat reasons I can't quite do so yet. Probably by the next minor that adds the deprecation warnings in React 16.

[m4rcelofs]

Do note that warnings are already shown if running in StrictMode:

Warning: Unsafe lifecycle methods were found within a strict-mode tree:
    in StrictMode (at App.js:9)
    in App
    in ElementsRenderer
    in StaticContainer
    in StaticContainer (created by BaseRouter)
    in BaseRouter (created by ConnectedRouter)
    in ConnectedRouter (created by FarceRouter)
    in Provider (created by FarceRouter)
    in FarceRouter (at src/index.js:18)

componentWillReceiveProps: Please update the following components to use static getDerivedStateFromProps instead: Link

componentWillUpdate: Please update the following components to use componentDidUpdate instead: Link

Learn more about this warning here:
https://fb.me/react-strict-mode-warnings