[#238] Add codecov to pr creation

[pnatashap]

• Add codecov check to PR creation
• Change url in codecov
• Threshold is 90 (real is more then 96)

Fix #238

[pnatashap]

@yegor256 please take a look

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (63948d2) 95.50% compared to head (8db7aaa) 95.50%.
Report is 47 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #240   +/-   ##
=======================================
  Coverage   95.50%   95.50%           
=======================================
  Files          10       10           
  Lines         356      356           
=======================================
  Hits          340      340           
  Misses         16       16           

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[yegor256]

@rultor merge

[rultor]

@rultor merge

@yegor256 OK, I'll try to merge now. You can check the progress of the merge here

[rultor]

@rultor merge

@yegor256 Done! FYI, the full log is here (took me 5min)