docs: add appleJax as a contributor

[allcontributors]

Adds @appleJax as a contributor for code, test.

This was requested by benmonro in this comment

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[benmonro]

@kentcdodds If you're cool w/ this, Kevin and I pair programmed a lot of this on zoom. Even though I was typing all the [] and () many of the ideas came from him as much as me...

[codecov]

Codecov Report

Merging #594 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #594   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           24        24           
  Lines          535       535           
  Branches       133       133           
=========================================
  Hits           535       535           

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[kentcdodds]

🎉 This PR is included in version 7.7.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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