Update voice channel if we move to different channels.

discord/client.py

@@ -340,10 +340,14 @@ class Client:
         if event == 'VOICE_STATE_UPDATE':
             user_id = data.get('user_id')
             if user_id == self.user.id:
+                if self.is_voice_connected():
+                    self.voice.channel = self.get_channel(data.get('channel_id'))
+
                 self.session_id = data.get('session_id')
                 log.debug('Session ID found: {}'.format(self.session_id))
                 self._session_id_found.set()
 
+
         if event == 'VOICE_SERVER_UPDATE':
             self._voice_data_found.data = data
             log.debug('Voice connection data found: {}'.format(data))