Add coverage upload.

[wRAR]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.58%. Comparing base (c1e4803) to head (c94115d).
Report is 141 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #239      +/-   ##
==========================================
- Coverage   90.24%   89.58%   -0.66%     
==========================================
  Files          13       13              
  Lines         605      634      +29     
  Branches      136      137       +1     
==========================================
+ Hits          546      568      +22     
- Misses         52       54       +2     
- Partials        7       12       +5     

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