fix #21 - which I thought I had fixed long ago but did not

meshtastic/__init__.py

@@ -709,7 +709,7 @@ class SerialInterface(StreamInterface):
                 raise Exception("No Meshtastic devices detected")
             elif len(ports) > 1:
                 raise Exception(
-                    f"Multiple ports detected, you must specify a device, such as {ports[0].device}")
+                    f"Multiple ports detected, you must specify a device, such as {ports[0]}")
             else:
                 devPath = ports[0]