mpd: bitrate in status response is always an int
mpd: bitrate in status response is always an int

Fixes #577

jmarsik/mopidy,jodal/mopidy,glogiotatidis/mopidy,bacontext/mopidy,bencevans/mopidy,bacontext/mopidy,swak/mopidy,vrs01/mopidy,liamw9534/mopidy,quartz55/mopidy,rawdlite/mopidy,hkariti/mopidy,pacificIT/mopidy,ali/mopidy,swak/mopidy,hkariti/mopidy,jmarsik/mopidy,vrs01/mopidy,pacificIT/mopidy,jmarsik/mopidy,dbrgn/mopidy,jcass77/mopidy,tkem/mopidy,mopidy/mopidy,glogiotatidis/mopidy,hkariti/mopidy,mokieyue/mopidy,jcass77/mopidy,mopidy/mopidy,bencevans/mopidy,quartz55/mopidy,bencevans/mopidy,rawdlite/mopidy,quartz55/mopidy,abarisain/mopidy,SuperStarPL/mopidy,dbrgn/mopidy,kingosticks/mopidy,priestd09/mopidy,diandiankan/mopidy,hkariti/mopidy,SuperStarPL/mopidy,ali/mopidy,swak/mopidy,priestd09/mopidy,pacificIT/mopidy,tkem/mopidy,mokieyue/mopidy,bacontext/mopidy,bencevans/mopidy,adamcik/mopidy,jodal/mopidy,rawdlite/mopidy,pacificIT/mopidy,ZenithDK/mopidy,ZenithDK/mopidy,kingosticks/mopidy,SuperStarPL/mopidy,glogiotatidis/mopidy,tkem/mopidy,bacontext/mopidy,ZenithDK/mopidy,rawdlite/mopidy,liamw9534/mopidy,swak/mopidy,jcass77/mopidy,glogiotatidis/mopidy,kingosticks/mopidy,adamcik/mopidy,dbrgn/mopidy,vrs01/mopidy,tkem/mopidy,priestd09/mopidy,abarisain/mopidy,mokieyue/mopidy,ZenithDK/mopidy,dbrgn/mopidy,SuperStarPL/mopidy,diandiankan/mopidy,mokieyue/mopidy,vrs01/mopidy,mopidy/mopidy,jodal/mopidy,ali/mopidy,diandiankan/mopidy,ali/mopidy,quartz55/mopidy,diandiankan/mopidy,woutervanwijk/mopidy,woutervanwijk/mopidy,adamcik/mopidy,jmarsik/mopidy