Add codecov.io integration

[smira]

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@29b5879). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master       #5   +/-   ##
=========================================
  Coverage          ?   83.69%           
=========================================
  Files             ?        4           
  Lines             ?      233           
  Branches          ?        0           
=========================================
  Hits              ?      195           
  Misses            ?       36           
  Partials          ?        2

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