Update workshopper to 0.5.0

node.js does not exit after selecting a 'problem' until I click enter.
Version 0.5.0 only has a few bugfixes and updates terminal-menu to
version 0.2.0, which fixes this issue.

Commit f5d141d2108ffa8c7f420700f68afcc7185f17ac in
substack/terminal-menu/index.js seems to have made the difference.