Adding codecov badge to list of excluded patterns.

[morganzellers]

Checklist:

• [x] Did you sign the Contributor License Agreement?
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[codecov-commenter]

Codecov Report

Merging #194 (902cf9e) into main (40432d4) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #194   +/-   ##
=======================================
  Coverage   90.97%   90.97%           
=======================================
  Files         102      102           
  Lines        2538     2538           
=======================================
  Hits         2309     2309           
  Misses        229      229           

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