Release v3.0.0a4
Release v3.0.0a4

jodal/mopidy,kingosticks/mopidy,jcass77/mopidy,kingosticks/mopidy,jcass77/mopidy,jodal/mopidy,adamcik/mopidy,jcass77/mopidy,mopidy/mopidy,mopidy/mopidy,adamcik/mopidy,adamcik/mopidy,kingosticks/mopidy,mopidy/mopidy,jodal/mopidy