Add missing implementation for create_stream_player.
Add missing implementation for create_stream_player.

jhgg/discord.py,Harmon758/discord.py,Rapptz/discord.py,imayhaveborkedit/discord.py,Harmon758/discord.py,lgkern/PriestPy,rapptz/discord.py,Theoretical/UselessBot,khazhyk/discord.py,variablehair/Eggplantato,mgardne8/discord.py