add examples to lint and fix warnings

examples/pub_sub_example.py

@@ -13,7 +13,7 @@ if len(sys.argv) < 2:
     print(f"usage: {sys.argv[0]} host")
     sys.exit(1)
 
-def onConnection(interface, topic=pub.AUTO_TOPIC):
+def onConnection(interface, topic=pub.AUTO_TOPIC): # pylint: disable=unused-argument
     """This is called when we (re)connect to the radio."""
     print(interface.myInfo)
     interface.close()