Add Client.start and Client.run shortcuts.
Add Client.start and Client.run shortcuts.

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