chore(package): update babel-preset-env to version 1.4.0

[make-github-pseudonymous-again]

https://greenkeeper.io/

[codecov-io]

Codecov Report

Merging #7 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master     #7   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          11     11           
  Lines          41     41           
=====================================
  Hits           41     41

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[coveralls]

Coverage remained the same at 100.0% when pulling 73ab6e2 on greenkeeper/babel-preset-env-1.4.0 into 5a9ce9c on master.