.on() doesnt register multiple listeners

[yesitsfebreeze]

Would it be possible to implement the on listener in a different way to this?
Currently the problem is that you cant register multiple listeners via .on, due to the fact that the callback is passed into the lambda.
https://github.com/geckosio/geckos.io/blob/master/packages/server/src/geckos/channel.ts#L272

this would be sufficient i guess:

listener = (callback, ....) => {
  ...
}.bind(callback)

this.eventEmitter.on(eventName, listener)