client.go
func (c *Client) GetChannelUsers(name string) (*Users, error) {
	path := fmt.Sprintf("/apps/%s/channels/%s/users", c.AppId, name)
	u, err := createRequestURL("GET", c.Host, path, c.Key, c.Secret, authTimestamp(), c.Secure, nil, nil, c.Cluster)
	if err != nil {
		return nil, err
	}
	response, err := c.request("GET", u, nil)
	if err != nil {
		return nil, err
	}
	return unmarshalledChannelUsers(response)
}
func (c *Client) GetChannelUsers(name string) (*Users, error) {
	path := fmt.Sprintf("/apps/%s/channels/%s/users", c.AppId, name)
	u, err := createRequestURL("GET", c.Host, path, c.Key, c.Secret, authTimestamp(), c.Secure, nil, nil, c.Cluster)
	if err != nil {
		return nil, err
	}
	response, err := c.request("GET", u, nil)
	if err != nil {
		return nil, err
	}
	return unmarshalledChannelUsers(response)
}
/*
Get a list of users in a presence-channel by passing to this method the channel name.

	users, err := client.GetChannelUsers("presence-chatroom")

	//users=> &{List:[{Id:13} {Id:90}]}

*/