support new reaction emoji from GitHub.com

[annthurium]

Description of the Change

GitHub.com now supports reaction emoji: 👀 and 🚀 . Therefore, we should make sure these new emoji render when viewing pull requests and issues within Atom.

Also, now we don't render anything if the emoji is unrecognized. Hooray for graceful degradation.

Screenshot/Gif

N/A

Alternate Designs

N/A

Benefits

Emoji make subtext into text and enable remote communication and brings empathy into the development process. Letting our users use more kinds of emoji enables more communication modes.

Possible Drawbacks

Can't think of any.

Applicable Issues

#1916

Metrics

N/A

Tests

• Wrote unit tests for the new emoji, graceful degradation
• Manually rendered the issue that describes this problem (so meta) to verify the new emoji show up.

Documentation

N/A

Release Notes

• The GitHub package now supports new reaction emoji: 👀 and 🚀

User Experience Research (Optional)

N/A

[codecov]

Codecov Report

Merging #1985 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1985      +/-   ##
==========================================
+ Coverage   92.12%   92.13%   +0.01%     
==========================================
  Files         188      188              
  Lines       10803    10806       +3     
  Branches     1581     1581              
==========================================
+ Hits         9952     9956       +4     
+ Misses        851      850       -1

Impacted Files	Coverage Δ
lib/views/emoji-reactions-view.js	100% <100%> (ø)	⬆️
lib/models/operation-states.js	91.66% <0%> (+2.08%)	⬆️

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[smashwilson]

👍 Hell yeah