docs: add SergioChan as a contributor for code

[allcontributors]

Adds @SergioChan as a contributor for code.

This was requested by Belphemur in this comment

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.60%. Comparing base (f376e98) to head (af2c0af).
⚠️ Report is 6 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1132   +/-   ##
========================================
  Coverage    99.60%   99.60%           
========================================
  Files           12       12           
  Lines         1527     1531    +4     
  Branches       322      226   -96     
========================================
+ Hits          1521     1525    +4     
  Misses           6        6           

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