React 16.9.0 support webpack plugin

[Bnaya]

Due to changes in react 16.9, the patch in the webpack plugin no longer works
Also, seems like they baked react-refresh code into react-dom, that is very similar to this code,
So maybe with some tweaks this patch won't be needed at all?

The change:

if (child.tag === Fragment ? element.type === REACT_FRAGMENT_TYPE : child.elementType === element.type)

        if (child.tag === Fragment ? element.type === REACT_FRAGMENT_TYPE : child.elementType === element.type || (
        // Keep this check inline so it only runs on the false path:
        isCompatibleFamilyForHotReloading(child, element))) 

Related: hot-loader/react-dom#14

[Bnaya]

NOTE: master has failing tests,
https://travis-ci.org/gaearon/react-hot-loader/jobs/567475841#L750-L751
But the ci.sh exit with exit code 0 and not 1.

[theKashey]

So maybe with some tweaks this patch won't be needed at all?

Out logic is a bit different. It's possible to change our API to match react expectations, but not quite like this.