rajout de la commande 4 en reception

Coderobot.py

@@ -9,7 +9,9 @@ def on_received_number(receivedNumber):
         GoForward()
     if receivedNumber == 2:
         GoBackward()
-    if receivedNumber == 3:
+    if receivedNumber == 3:    
+        Dance()
+    if receivedNumber == 4:
         Dance()
 radio.on_received_number(on_received_number)