Remove double invocation of eslint

[michaelw85]

"npm run lint" triggers eslint

[codecov-io]

Codecov Report

Merging #42 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #42   +/-   ##
=======================================
  Coverage   51.38%   51.38%           
=======================================
  Files           1        1           
  Lines         216      216           
  Branches       46       46           
=======================================
  Hits          111      111           
  Misses        105      105

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