Add missing Role import in Client.
Add missing Role import in Client.

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