Add back Codecov

[tianon]

Let's give them another chance 😇

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (master@0dbb69e). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #44   +/-   ##
=========================================
  Coverage          ?   78.35%           
=========================================
  Files             ?        7           
  Lines             ?      670           
  Branches          ?        0           
=========================================
  Hits              ?      525           
  Misses            ?      110           
  Partials          ?       35           

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[tianon]

wtf, why u no comment on #53, codecov

[tianon]

https://community.codecov.com/t/upload-issues-unable-to-locate-build-via-github-actions-api/3954 😞