[READY] Update CI config

[bstaletic]

PR Prelude

Thank you for working on YCM! :)

Please complete these steps and check these boxes (by putting an x inside
the brackets) before filing your PR:

• I have read and understood YCM's CONTRIBUTING document.
• I have read and understood YCM's CODE_OF_CONDUCT document.
• I have included tests for the changes in my PR. If not, I have included a
  rationale for why I haven't.
• I understand my PR may be closed if it becomes obvious I didn't
  actually perform all of these steps.

Why this change is necessary and useful

This is similar to ycm-core/ycmd#1746

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This change is 

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.85%. Comparing base (52618ae) to head (a8018f9).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4240   +/-   ##
=======================================
  Coverage   89.85%   89.85%           
=======================================
  Files          37       37           
  Lines        4780     4780           
=======================================
  Hits         4295     4295           
  Misses        485      485           

[puremourning]

Reviewable status: 1 of 2 LGTMs obtained

[puremourning]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: 1 of 2 LGTMs obtained (waiting on @bstaletic)

[bstaletic]

This one fixes the CI failures. Merging.

[mergify]

Thanks for sending a PR!