feat(TextArea): add autoHeight prop

[luski]

Fixes #982

Tested on Chrome and Firefox. I'll provide test cases in further commit in the nearest future

[codecov-io]

Current coverage is 95.84% (diff: 100%)

Merging #1083 into master will increase coverage by <.01%

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  Methods           0          0          
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+ Hits           4626       4634     +8   
  Misses          201        201          
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[luski]

I have no idea how to write tests checking if height of the textarea element changed. Any clues?

[levithomason]

Thanks for getting this going. I've refactored it a bit, adding docs and tests. LMK if anything looks out of place. I'll get a final review on this and merge once tests pass and you sign off on my updates.

[levithomason]

Also, can you please update the PR description so it closes the issue when merged? Docs here.

[luski]

Looks great, thanks.
resolves #982 - is it enough to close the issue when merged?

[levithomason]

Cool, thanks. There seems to be a 1px rendering difference on CI than locally. I'll try to fix this.

The comment will need to be in the main description of the PR to close the issue 👍

[levithomason]

Released in semantic-ui-react@0.63.2.