Upgrade requirements to stable aiohttp.
Upgrade requirements to stable aiohttp.

Also lighten up on websockets requirements.

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