code: func (c *Client) TriggerExclusive(channel string, eventName string, data interface{}, socketID string) (*BufferedEvents, error) {
  	return c.trigger([]string{channel}, eventName, data, &socketID)
  }
docs: /*
  This method allow you to exclude a recipient whose connection has that
  `socket_id` from receiving the event. You can read more here: http://pusher.com/docs/duplicates.
  
  	client.TriggerExclusive("a_channel", "event", data, "123.12")
  
  */