fix syntax error

src/cul2mqtt.py

@@ -36,7 +36,7 @@ if len(sys.argv) >= 2:
         verbose = False
     elif sys.argv[1] == "-v":
         verbose = True
-    elif sys.argv[1] == "-d"
+    elif sys.argv[1] == "-d":
         debug = True
         verbose = True