Add codecov config

[IgorSusmelj]

Changes

• Added a codecov.yml config file to make codecov pass even if the coverage slightly goes down by 0.5% as recommended. This will allow us to enforce again that all tests have to pass in order to merge a PR (we disabled this as codecov got annoying)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (deb3c31) 85.50% compared to head (934f20d) 85.50%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1472   +/-   ##
=======================================
  Coverage   85.50%   85.50%           
=======================================
  Files         135      135           
  Lines        5657     5657           
=======================================
  Hits         4837     4837           
  Misses        820      820           

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[guarin]

LGTM! Are you sure this are the only required fields?