Add codecov plugin

[nryanov]

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@843ef5e). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #58   +/-   ##
=========================================
  Coverage          ?   54.67%           
=========================================
  Files             ?       81           
  Lines             ?     1584           
  Branches          ?       28           
=========================================
  Hits              ?      866           
  Misses            ?      718           
  Partials          ?        0           

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