Update btns.py

btns.py

@@ -11,7 +11,6 @@ def main():
   while True: # Run forever
       if GPIO.input(13) == GPIO.HIGH:
           print("no")
-          return "no"
           break
       if GPIO.input(15) == GPIO.HIGH:
           print("down")
@@ -30,5 +29,6 @@ if __name__ == '__main__':
 
   try:
     main()
+    return
   finally:
     GPIO.cleanup()