Correctly update the version number to 1.1.2

I mistakenly forgot to do this when creating the v1.1.2 tag.
Use interned symbols for tag commands

Signed-off-by: Eric James Michael Ritz <lobbyjones@gmail.com>
List Sebastian Wiesner as a contributor
Update the version number to 1.2.0

This version contains an important fix for the default key-bindings,
provided by Sebastian Wiesner (21e18358).