Fix play

[za419]

Currently, play will not connect to a voice channel - The bot will connect to the cadence upstream, but cannot play music to users because it times out trying to connect music to the voice channel.

Figure out why, and fix that.

I have a feeling this is connected to #119 - An outdated and unsupported version of discord.js might not properly interact with voice channels anymore - So perhaps start by micro-testing whether it works with new discord.js without checking new functionality, and if that's all that's needed merge this in with #119 and complete that task instead as a two-for-one.