Update changelog for v0.7.0 release
Update changelog for v0.7.0 release

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