docs: add just-boris as a contributor

[allcontributors]

Adds @just-boris as a contributor for bug.

This was requested by ph-fritsche in this comment

[codecov]

Codecov Report

Merging #568 (9314a32) into master (73c2323) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #568   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           13        13           
  Lines          706       706           
  Branches       222       222           
=========================================
  Hits           706       706           

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[github-actions]

🎉 This PR is included in version 12.8.0 🎉

The release is available on:

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

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