v0.22.1

This is identical to v0.22.0 but the tag is signed. My bad - I should
have signed v0.22.0 originally.

Move widget configurations to `_configure`

The `Mpd2` and `PulseVolume` widgets have code in their `__init__`
methods that is better suited to the `_configure` method.

Release v0.18.1

Release v0.18.0

Release 0.17.0

Release 0.16.1

Mostly this is intended for the distro people, who can now consume the
tests.

Signed-off-by: Tycho Andersen <[email protected]>

Release 0.16.0

Signed-off-by: Tycho Andersen <[email protected]>