Output a newline before process exit on "q" keypress.

There is a finally() on the promise to output a newline but this
doesn't get hit when calling process.exit(). A small annoyance, but
this ensures that on "q" the user's command prompt isn't stuck on the
last output line.
Merge pull request #170 from Blackshawk/master

Output a newline before process exit on "q" keypress.