Fix/publish new version

[rallysson]

What kind of change does this PR introduce?
Bug fix

What is the current behavior?
Without the postinstall script, Travis CI would pick up parse from date-fns v1 because the fake package date-fns-v2 dependencies are not installed.

What is the new behavior?
The dependencies of the date-fns-v2 folder are installed after the library dependencies.

[vercel]

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[codecov-io]

Codecov Report

Merging #13 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #13   +/-   ##
=====================================
  Coverage     9.5%   9.5%           
=====================================
  Files          13     13           
  Lines         284    284           
  Branches       56     56           
=====================================
  Hits           27     27           
  Misses        205    205           
  Partials       52     52

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[arthurdenner]

Thanks, @rallysson! Great fix, I totally missed this detail.