bug: String arrays with `/Volumes/Macintosh HD` are converted to `/Volumes/MacintoshHD`

[apexskier]

I discovered this bug when working on apexskier/nova-eslint#75.

Run the following in a node console:

require("optionator")({
    options: [{ option: "dir", type: "[path::String]" }]
}).parse(["node", "bin", "--dir", "/Volumes/Macintosh HD/test path"])

Expected output:

{ dir: [ '/Volumes/Macintosh HD/test path' ], _: [] }

Actual output:

{ dir: [ '/Volumes/MacintoshHD/test path' ], _: [] }

This appears to reproduce with the type [String] as well. It doesn't seem to generally strip the first space "/Volum es/Maci ntosh HD/test path" results in '/Volum es/Macintosh HD/test path'.

[apexskier]

#35