features added (#14)

* Update group_object.h

* Update group_object.cpp

* Update knx_facade.cpp

src/knx_facade.cpp

@@ -46,6 +46,7 @@ bool KnxFacade::progMode()
 
 void KnxFacade::progMode(bool value)
 {
+    Serial.println("progmode");
     _bau.deviceObject().progMode(value);
 }