docs: add itaischwartz as a contributor for code

[allcontributors]

Add @itaischwartz as a contributor for code.

This was requested by markphelps in this comment

[codecov-commenter]

Codecov Report

Merging #519 (df5d47d) into master (236b4cd) will not change coverage.
The diff coverage is n/a.

❗ Current head df5d47d differs from pull request most recent head 52d9048. Consider uploading reports for the commit 52d9048 to get more accurate results

@@           Coverage Diff           @@
##           master     #519   +/-   ##
=======================================
  Coverage   82.99%   82.99%           
=======================================
  Files          16       16           
  Lines        1441     1441           
=======================================
  Hits         1196     1196           
  Misses        211      211           
  Partials       34       34           

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