Replace componentWillReceiveProps with something else

[hlolli]

Just to clear annoying warning

react-dom.development.js:12029 Warning: componentWillReceiveProps has been renamed, and is not recommended for use. See https://fb.me/react-async-component-lifecycle-hooks for details.

* Move data fetching code or side effects to componentDidUpdate.
* If you're updating state whenever props change, refactor your code to use memoization techniques or move it to static getDerivedStateFromProps. Learn more at: https://fb.me/react-derived-state
* Rename componentWillReceiveProps to UNSAFE_componentWillReceiveProps to suppress this warning in non-strict mode. In React 17.x, only the UNSAFE_ name will work. To rename all deprecated lifecycles to their new names, you can run `npx react-codemod rename-unsafe-lifecycles` in your project source folder.

Please update the following components: Controlled

UNSAFE_ prefix can be added as a fast workaround. This warning comes with Controlled and UnControlled.

[schanzer]

This feels like a dupe of #134

[scniro]

@hlolli @schanzer I am a lot shorter on time these days as when I started this project. Codemirror & React APIs are moving to quickly for me to keep atop of for the day-to-day. I am looking for a co-maintainer of this project. Please contact me directly if you are interested. Thank you for understanding.

[fongandrew]

#176 is merged, so this should be resolved now. You'll need to update to v6.0.1 or v7