Sync up ignore files with graphql-js

[IvanGoncharov]

No description provided.

[codecov]

Codecov Report

Merging #259 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #259   +/-   ##
=======================================
  Coverage   99.51%   99.51%           
=======================================
  Files          19       19           
  Lines         621      621           
  Branches       36       36           
=======================================
  Hits          618      618           
  Misses          3        3           

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