Bumped to version 0.9.1.

Updated deps.

Bumped rc version.

Bumped rc version.

Bump rc version.

Only support version data in dev mode.

It's too tricky getting a Lisp-named plugin as a dep in a Hex package (looks
like there might be a rebar3 bug, as attempting to do a workaroundn with
overrides ended up with infinite recursion between some symbolic links ...).

Updated to latest Erlang 18.

Updated for travis.

Remove rebar ("solves" a problem on older Erlang releases).

Bumped version.