Change typing event channel to any type of channel

[ZeWebDev]

Fixes an error when the typing event is fired on a DM channel the second time because the channel is of the class GuildChannel

[l7ssha]

@ZeWebDev Hello, I'm working on fork of this library. If you wanna contribute please send pull request to this repo. It seems this project is dead, so I've forked and started to work with it.