simplify cli

[aleclarson]

NodeJS programs have an exit code of zero by default, so there's no need for any code here.

[mde]

Brevity is the soul of wit, but now the CLI appears to be a no-op. We do need a functional CLI, to duplicate the behavior of Unix true utility.

[aleclarson]

man true describes the true command as "The true utility always returns with exit code zero."

A no-op accomplishes that. Am I missing something? :)