Added support for banning users.

[w3bprinz]

No description provided.

[coveralls]

Coverage increased (+0.04%) to 97.956% when pulling 4e0af24 on w3bprinz:master into b173bfc on gempir:master.

[gempir]

Please add a test for it, otherwise looks fine

[w3bprinz]

Please add a test for it, otherwise looks fine

I'm not that familar with github, how can I add a test?

[gempir]

This has nothing to do with github. I'd like to have a unit test for this functionality.

Other test for example https://github.com/gempir/go-twitch-irc/blob/master/client_test.go#L1007

Also the linter also still has issues with your code

[gempir]

It might make sense to look at other tests like this as well because they actually assert the correct message which we want in this case. https://github.com/gempir/go-twitch-irc/blob/master/client_test.go#L1068