componentWillReceiveProps is deprecated since React 16.3.0

[ryan-roemer]

We've disabled these, but:

/Users/rye/scm/fmd/spectacle/src/components/anim.js
  11:1  error  componentWillReceiveProps is deprecated since React 16.3.0, use UNSAFE_componentWillReceiveProps instead, see https://reactjs.org/docs/react-component.html#unsafe_componentwillreceiveprops  react/no-deprecated

[kale-stew]

Consolidating my notes on this issue for our own reference. I'm going to take this issue on

componentWillMount

• typically replaced by the constructor or componentDidMount
• we're using this method in two places:
  • notes.js
  • manager.js

componentWillReceiveProps

• should be replaced by getDerivedStateFromProps
• we're using this method in five places:
  • heading.js
  • text.js
  • magic-wrapper.js
  • component-playground.js
  • manager.js

[ebrillhart]

closed with #591