docs: update ci badge

[kerm1it]

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[codecov]

Codecov Report

Merging #705 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #705   +/-   ##
=======================================
  Coverage   88.26%   88.26%           
=======================================
  Files          10       10           
  Lines         690      690           
  Branches      178      178           
=======================================
  Hits          609      609           
  Misses         81       81           

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