Removed onEvent handler

With the recent change to the OnEvent event now always executing
insted of only on error we don't want this printing out every
single event.  A different way to handle unknown events will be
added in the wsapi.go code.

discord.go

@@ -225,18 +225,12 @@ func (s *Session) initialize() {
 	s.handlers = map[interface{}][]reflect.Value{}
 	s.handlersMu.Unlock()
 
-	s.AddHandler(s.onEvent)
 	s.AddHandler(s.onReady)
 	s.AddHandler(s.onVoiceServerUpdate)
 	s.AddHandler(s.onVoiceStateUpdate)
 	s.AddHandler(s.State.onInterface)
 }
 
-// onEvent handles events that are unhandled or errored while unmarshalling
-func (s *Session) onEvent(se *Session, e *Event) {
-	printEvent(e)
-}
-
 // onReady handles the ready event.
 func (s *Session) onReady(se *Session, r *Ready) {
 	go s.heartbeat(s.wsConn, s.listening, r.HeartbeatInterval)