Remove bountysource from donation page, update flattr
Remove bountysource from donation page, update flattr

chhe/streamlink,wlerin/streamlink,bastimeyer/streamlink,melmorabity/streamlink,streamlink/streamlink,beardypig/streamlink,melmorabity/streamlink,back-to/streamlink,gravyboat/streamlink,gravyboat/streamlink,beardypig/streamlink,wlerin/streamlink,bastimeyer/streamlink,streamlink/streamlink,chhe/streamlink,back-to/streamlink