ESLint: enable 'import/extensions' rule

[IvanGoncharov]

No description provided.

[codecov]

Codecov Report

Merging #273 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #273   +/-   ##
=======================================
  Coverage   99.49%   99.49%           
=======================================
  Files          19       19           
  Lines         595      595           
  Branches       38       38           
=======================================
  Hits          592      592           
  Misses          3        3           

Impacted Files	Coverage Δ
src/__tests__/starWarsConnectionTests.js	100.00% <100.00%> (ø)
src/__tests__/starWarsMutationTests.js	100.00% <100.00%> (ø)
src/__tests__/starWarsObjectIdentificationTests.js	100.00% <100.00%> (ø)
src/__tests__/starWarsSchema.js	100.00% <100.00%> (ø)
src/connection/__tests__/connection.js	100.00% <100.00%> (ø)
src/connection/arrayconnection.js	100.00% <100.00%> (ø)
src/node/node.js	100.00% <100.00%> (ø)

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