Update ESLint and sync up config with 'graphql-js'

[IvanGoncharov]

No description provided.

[codecov]

Codecov Report

Merging #260 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #260   +/-   ##
=======================================
  Coverage   99.51%   99.51%           
=======================================
  Files          19       19           
  Lines         621      621           
  Branches       36       36           
=======================================
  Hits          618      618           
  Misses          3        3           

Impacted Files	Coverage Δ
src/__tests__/starWarsConnectionTests.js	100.00% <ø> (ø)
src/__tests__/starWarsMutationTests.js	100.00% <ø> (ø)
src/__tests__/starWarsObjectIdentificationTests.js	100.00% <ø> (ø)
src/mutation/__tests__/mutation.js	96.29% <ø> (ø)
src/mutation/mutation.js	100.00% <ø> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 66242bc...4511b4d. Read the comment docs.