Enable skipped windows tests

[richardschneider]

See #167

[codecov]

Codecov Report

Merging #174 into master will increase coverage by 0.51%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #174      +/-   ##
==========================================
+ Coverage   89.23%   89.74%   +0.51%     
==========================================
  Files           3        3              
  Lines         195      195              
==========================================
+ Hits          174      175       +1     
+ Misses         21       20       -1

Impacted Files	Coverage Δ
src/exec.js	100% <0%> (+3.7%)	⬆️

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[daviddias]

AWESOME! :D