Fixes a bug in PR#181 and adds a test.

[Hypercubed]

Sorry for the bad PR, this fixes the bug I introduced and adds a test. Still not getting 100% coverage, unfortunately.

[Hypercubed]

I tried to get 100% coverage but I'm not familiar with the mocking setup.

[kentcdodds]

I'm fine if you want to add an /* istanbul ignore next */ comment where the coverage issue is.

[Hypercubed]

Will do...

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@e52b136). Click here to learn what that means.
The diff coverage is 100%.

@@           Coverage Diff           @@
##             master   #183   +/-   ##
=======================================
  Coverage          ?   100%           
=======================================
  Files             ?     12           
  Lines             ?    386           
  Branches          ?     93           
=======================================
  Hits              ?    386           
  Misses            ?      0           
  Partials          ?      0

Impacted Files	Coverage Δ
src/bin-utils/initialize/index.js	100% <ø> (ø)
src/bin-utils/parser.js	100% <100%> (ø)

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