docs: add xelandernt as a contributor for code, and bug

[allcontributors]

Adds @xelandernt as a contributor for code, bug.

This was requested by vivekjoshy in this comment

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (11ac382) to head (348c615).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #175   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           10        10           
  Lines         2047      2047           
  Branches       513       513           
=========================================
  Hits          2047      2047           

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