Update to use discord.py rewrite

[AndyReifman]

Currently the code is based on async which:

• Is no longer being supported
• Doesn't use all of the discord API
• Has less features
• Does not have complete documentation

And so it needs to be updated.

[ingenium21]

Do we have any examples of the best way to replace this?

[FelixRandle]

Solved via #55