Fixes subcommand listing

[nkakouros]

Fixes #238

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cc: @mbland

[coveralls]

Coverage remained the same at 94.997% when pulling 422c3c0 on tterranigma:subcommands into 292e080 on mbland:master.

[nkakouros]

@mbland You seem to be busy with work or other projects for almost a year now. I have been working on expanding go-script-bash but I am wondering if I should keep opening PRs and keeping track of my additions/changes. Or should I just work on my fork alone and forget about the upstream project?