docs: add martinezeguiluz as a contributor for code

[allcontributors]

Adds @martinezeguiluz as a contributor for code.

This was requested by handwerkerd in this comment

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.54%. Comparing base (670796b) to head (8a8484f).
Report is 49 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1032   +/-   ##
=======================================
  Coverage   89.54%   89.54%           
=======================================
  Files          26       26           
  Lines        3462     3462           
  Branches      632      632           
=======================================
  Hits         3100     3100           
  Misses        210      210           
  Partials      152      152           

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