Include how to update on readme.
Include how to update on readme.

As a beginner at this I had to look up how to updated livestreamer and I figured this might be helpful to others as well.
chhe/streamlink,fishscene/streamlink,hmit/livestreamer,wolftankk/livestreamer,derrod/livestreamer,streamlink/streamlink,Dobatymo/livestreamer,wlerin/streamlink,Saturn/livestreamer,bastimeyer/streamlink,blxd/livestreamer,melmorabity/streamlink,Feverqwe/livestreamer,back-to/streamlink,chhe/livestreamer,flijloku/livestreamer,javiercantero/streamlink,Klaudit/livestreamer,ethanhlc/streamlink,Masaz-/livestreamer,programming086/livestreamer,chrippa/livestreamer,gravyboat/streamlink,javiercantero/streamlink,caorong/livestreamer,lyhiving/livestreamer,ethanhlc/streamlink,charmander/livestreamer,chhe/livestreamer,blxd/livestreamer,streamlink/streamlink,wolftankk/livestreamer,Klaudit/livestreamer,hmit/livestreamer,sbstp/streamlink,okaywit/livestreamer,okaywit/livestreamer,melmorabity/streamlink,flijloku/livestreamer,beardypig/streamlink,bastimeyer/streamlink,intact/livestreamer,Saturn/livestreamer,gtmanfred/livestreamer,gravyboat/streamlink,gtmanfred/livestreamer,charmander/livestreamer,back-to/streamlink,lyhiving/livestreamer,wlerin/streamlink,fishscene/streamlink,jtsymon/livestreamer,programming086/livestreamer,beardypig/streamlink,jtsymon/livestreamer,Dobatymo/livestreamer,intact/livestreamer,sbstp/streamlink,chrippa/livestreamer,caorong/livestreamer,Feverqwe/livestreamer,Masaz-/livestreamer,chhe/streamlink,mmetak/streamlink,mmetak/streamlink,derrod/livestreamer