Add missing "f"

Author: bouwew

plugwise_usb/network/__init__.py

@@ -284,7 +284,7 @@ async def node_rejoin_message(self, response: PlugwiseResponse) -> bool:
                     _LOGGER.debug("duplicate awake discovery for %s", mac)
                 return True
         else:
-            raise NodeError("Unknown network address for node {mac}")
+            raise NodeError(f"Unknown network address for node {mac}")
         return True
 
     def _unsubscribe_to_protocol_events(self) -> None: