README: update the way that player handle sources (closes #39)
README: update the way that player handle sources (closes #39)

MariadeAnton/clappr,shakin/clappr,flavioribeiro/clappr,Metrakit/clappr,leandromoreira/clappr,Peer5/clappr,tarkanlar/clappr,wxmfront/clappr,clappr/clappr,shakin/clappr,dayvson/clappr,Peer5/clappr,tjenkinson/clappr,irongomme/clappr,clappr/clappr,clappr/clappr,tarkanlar/clappr,dayvson/clappr,burakkp/clappr,Peer5/clappr,irongomme/clappr,irongomme/clappr,tarkanlar/clappr,flavioribeiro/clappr,kelonye/clappr,jfairley/clappr,kelonye/clappr,jfairley/clappr,Pyrotoxin/clappr,Pyrotoxin/clappr,leandromoreira/clappr,Pyrotoxin/clappr,shakin/clappr,wxmfront/clappr,MariadeAnton/clappr,Metrakit/clappr,burakkp/clappr,kelonye/clappr,Metrakit/clappr,tjenkinson/clappr,burakkp/clappr,flavioribeiro/clappr,wxmfront/clappr,MariadeAnton/clappr,tjenkinson/clappr,jfairley/clappr,leandromoreira/clappr,dayvson/clappr