Version bump to 0.1.6

[derwinmcgeary]

Hi!

Thank you for the awesome package, which I use regularly.

I'm trying to get auto-complete working and I've realised it's because there's an older version 0.1.5 in Guix and auto-complete has been added in a later commit. I'd like to try to get a newer version into Guix. Would it be possible to do a version bump and have a new "official" release with 0.1.6?

[doolio]

Friendly ping @volrath.