Fix regex bug in ALSAWidget

Where amixer includes decibel levels in the output, the current
regex will fail and so no volume will be recognised.

This PR fixes that by making the regex less strict.

Fixes #33

qtile_extras/widget/alsavolumecontrol.py

@@ -6,7 +6,7 @@
 from libqtile.log_utils import logger
 from libqtile.widget import base
 
-RE_VOL = re.compile(r"Playback\s[0-9]+\s\[([0-9]+)%\]\s\[(on|off)\]")
+RE_VOL = re.compile(r"Playback\s[0-9]+\s\[([0-9]+)%\].*\[(on|off)\]")
 
 
 class ALSAWidget(base._Widget, base.PaddingMixin, base.MarginMixin):