Fix kickability.

disk/disk.go

@@ -73,7 +73,7 @@ func (client *Client) Close() error {
 	return nil
 }
 
-func (client *Client) kick(message string) error {
+func (client *Client) Kick(message string) error {
 	err := client.Close()
 	group.DelClient(client)
 	return err

rtpconn/webclient.go

@@ -909,7 +909,7 @@ func setPermissions(g *group.Group, id string, perm string) error {
 	return c.action(permissionsChangedAction{})
 }
 
-func (c *webClient) kick(message string) error {
+func (c *webClient) Kick(message string) error {
 	return c.action(kickAction{message})
 }