uvloop uses libs used by node.js and has been shown to be a much more efficient event loop policy than the default Python asyncio implementation. If uvloop is installed, this is quietly changed before the bot is initialised. If uvloop cannot be set, either from not being installed, or from being used on an unsupported system such as Windoze, then nothing is changed.
The only change should be a slight increase in throughput if it is detected.
Please test first.
