Add sbt-codecov plugin

[alejandrohdezma]

No description provided.

[codecov]

Codecov Report

Merging #157 into master will not change coverage by %.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #157   +/-   ##
=======================================
  Coverage   82.60%   82.60%           
=======================================
  Files          21       21           
  Lines         184      184           
  Branches        0        1    +1     
=======================================
  Hits          152      152           
  Misses         32       32           

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