Add timestamp to logs in rtl_433_mqtt_hass (#2566)

Prefix log entries with a timestamp to make it easier to determine when an event happened.

examples/rtl_433_mqtt_hass.py

@@ -855,6 +855,7 @@ def run():
 
 
 if __name__ == "__main__":
+    logging.basicConfig(format='[%(asctime)s] %(levelname)s:%(name)s:%(message)s',datefmt='%Y-%m-%dT%H:%M:%S%z')
     logging.getLogger().setLevel(logging.INFO)
 
     parser = argparse.ArgumentParser(formatter_class=argparse.RawDescriptionHelpFormatter,