Add support for React 16

I think it would be great if this plugin would be ready with supporting all the new things that React 16 has to offer.

Currently I’m not sure exactly what would need to to be added though. The only thing I could think of was the componentDidCatch “lifecycle method” that got added. This should be added to a number of rules (prop-types, no-unused-prop-types, no-typos) and should only be checked when using React 16.

[jseminck]

Another thing we should test: since it’s now possible to return an array from render(), but the array does require keys at the moment. So we should check whether the current rule react/no-array-index-key: Prevent using Array index in key props works for this case…

render() {
  // No need to wrap list items in an extra element!
  return [
    // Don't forget the keys :)
    <li key="A">First item</li>,
    <li key="B">Second item</li>,
    <li key="C">Third item</li>,
  ];
}

Edit: it works already. The rule was already smart enough to detect arrays!

[amannn]

Another one I just stumbled across: react/sort-comp should recognize componentDidCatch as a lifecycle method in the order property.