docs: add schoeneu as a contributor

[allcontributors]

Adds @schoeneu as a contributor for bug.

This was requested by ph-fritsche in this comment

[codecov]

Codecov Report

Merging #580 (7597f16) into master (4e48750) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #580   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           13        13           
  Lines          719       719           
  Branches       228       228           
=========================================
  Hits           719       719           

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[github-actions]

🎉 This PR is included in version 12.8.3 🎉

The release is available on:

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

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