Add codecov inline PR comments

[lebrice]

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 86.44%. Comparing base (3194331) to head (43f898c).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #305   +/-   ##
=======================================
  Coverage   86.44%   86.44%           
=======================================
  Files          34       34           
  Lines        4531     4531           
=======================================
  Hits         3917     3917           
  Misses        614      614           

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