Added comment (commit-to-merge)

tests/lamp_schem.go

@@ -46,6 +46,7 @@ func main() {
 	lamp.SetMethod("turn_on", turnOn)
 	lamp.SetMethod("turn_off", turnOff)
 
+	// We add a button for GroupID test purpose
 	addr, _ = addr.Add(1)
 	btn := schemas.NewButton(addr)
 	btn.Info = "Fake button from schemas"