remove ext encode from fetchart (py3 fix for #2068)
remove ext encode from fetchart (py3 fix for #2068)

artemutin/beets,jcoady9/beets,pkess/beets,sampsyo/beets,MyTunesFreeMusic/privacy-policy,beetbox/beets,SusannaMaria/beets,diego-plan9/beets,madmouser1/beets,beetbox/beets,xsteadfastx/beets,diego-plan9/beets,pkess/beets,artemutin/beets,sampsyo/beets,lengtche/beets,jcoady9/beets,ibmibmibm/beets,lengtche/beets,artemutin/beets,jackwilsdon/beets,shamangeorge/beets,jackwilsdon/beets,jcoady9/beets,beetbox/beets,beetbox/beets,MyTunesFreeMusic/privacy-policy,artemutin/beets,sampsyo/beets,lengtche/beets,SusannaMaria/beets,xsteadfastx/beets,Kraymer/beets,SusannaMaria/beets,madmouser1/beets,mosesfistos1/beetbox,mosesfistos1/beetbox,Kraymer/beets,shamangeorge/beets,madmouser1/beets,mosesfistos1/beetbox,pkess/beets,Kraymer/beets,ibmibmibm/beets,jackwilsdon/beets,MyTunesFreeMusic/privacy-policy,madmouser1/beets,xsteadfastx/beets,ibmibmibm/beets,jackwilsdon/beets,ibmibmibm/beets,xsteadfastx/beets,diego-plan9/beets,lengtche/beets,sampsyo/beets,MyTunesFreeMusic/privacy-policy,shamangeorge/beets,shamangeorge/beets,jcoady9/beets,mosesfistos1/beetbox,SusannaMaria/beets,Kraymer/beets,diego-plan9/beets,pkess/beets