docs: add pheeria as a contributor

[allcontributors]

Adds @pheeria as a contributor for test.

This was requested by kentcdodds in this comment

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[codecov]

Codecov Report

Merging #393 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #393   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          21     21           
  Lines         369    369           
  Branches       88     88           
=====================================
  Hits          369    369

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[kentcdodds]

🎉 This PR is included in version 6.9.0 🎉

The release is available on:

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

Your semantic-release bot 📦🚀