plugins: make the signature of notify_info_yielded clearer
plugins: make the signature of notify_info_yielded clearer

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