Fix codecov coverage upload

[andrzejressel]

Fixes #937

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@1ae8920). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #938   +/-   ##
=========================================
  Coverage          ?   45.42%           
  Complexity        ?      647           
=========================================
  Files             ?      309           
  Lines             ?     7972           
  Branches          ?      859           
=========================================
  Hits              ?     3621           
  Misses            ?     4035           
  Partials          ?      316

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[raulraja]

thanks @jereksel !