code: func (c *Client) TriggerMulti(channels []string, eventName string, data interface{}) (*BufferedEvents, error) {
  	return c.trigger(channels, eventName, data, nil)
  }
docs: /*
  The same as `client.Trigger`, except one passes in a slice of `channels` as the first parameter.
  The maximum length of channels is 100.
  	client.TriggerMulti([]string{"a_channel", "another_channel"}, "event", data)
  */