Flow updates

[jdelStrother]

I was running into flow difficulties using Async & AsyncCreatable - their HOC functions were losing the defaultProps of the components, so, eg:

<Async loadOptions={loadOptions} />

would complain with the following:

Cannot create Async element because:
 • property cacheOptions is missing in props [1] but exists in AsyncProps [2].
 • property defaultOptions is missing in props [1] but exists in AsyncProps [2].
 • property onInputChange is missing in props [1] but exists in AsyncProps [2].

WDYT to this?

I've also changed a couple of string types to React$Node - the children of SingleValue, and the return value from noOptionsMessage. There shouldn't be any functional code changes, just type changes.

[mufasa71]

@jdelStrother I did almost the same here #3538 😄

[jdelStrother]

@JedWatson anything that me/mufasa71 can do to help get either of these merged? I'll fix my merge conflicts if you're intending to merge this.

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[emmatown]

Thanks!!