plugins.afreecatv: Update for service changes.
plugins.afreecatv: Update for service changes.

Resolves #488.

okaywit/livestreamer,flijloku/livestreamer,back-to/streamlink,wolftankk/livestreamer,Masaz-/livestreamer,wlerin/streamlink,gtmanfred/livestreamer,Saturn/livestreamer,mmetak/streamlink,okaywit/livestreamer,chrippa/livestreamer,sbstp/streamlink,intact/livestreamer,javiercantero/streamlink,ethanhlc/streamlink,hmit/livestreamer,lyhiving/livestreamer,bastimeyer/streamlink,programming086/livestreamer,caorong/livestreamer,streamlink/streamlink,jtsymon/livestreamer,bastimeyer/streamlink,chhe/livestreamer,Feverqwe/livestreamer,chhe/streamlink,Saturn/livestreamer,blxd/livestreamer,Feverqwe/livestreamer,blxd/livestreamer,melmorabity/streamlink,gravyboat/streamlink,Klaudit/livestreamer,back-to/streamlink,caorong/livestreamer,Masaz-/livestreamer,wlerin/streamlink,derrod/livestreamer,fishscene/streamlink,wolftankk/livestreamer,streamlink/streamlink,fishscene/streamlink,hmit/livestreamer,derrod/livestreamer,intact/livestreamer,ethanhlc/streamlink,Dobatymo/livestreamer,beardypig/streamlink,Dobatymo/livestreamer,charmander/livestreamer,programming086/livestreamer,gravyboat/streamlink,chhe/livestreamer,mmetak/streamlink,jtsymon/livestreamer,sbstp/streamlink,gtmanfred/livestreamer,melmorabity/streamlink,Klaudit/livestreamer,charmander/livestreamer,javiercantero/streamlink,flijloku/livestreamer,chrippa/livestreamer,lyhiving/livestreamer,beardypig/streamlink,chhe/streamlink