Fix relative paths on windows.

[felippepuhle]

Fixes #67.

[codecov-io]

Codecov Report

Merging #71 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #71   +/-   ##
=======================================
  Coverage   83.01%   83.01%           
=======================================
  Files          13       13           
  Lines         212      212           
=======================================
  Hits          176      176           
  Misses         36       36

Impacted Files	Coverage Δ
packages/generator/src/utils.js	94.79% <100%> (ø)	✅

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[lucasbento]

I'll close and open this PR to trigger AppVeyor testing.

[lucasbento]

Nevermind, this damn thing needs the yaml file.

It looks good, gonna merge it! :D

Thanks, @felippepuhle.