Fix type annotations

trio_paho_mqtt/client.py

@@ -5,12 +5,12 @@ from typing import Any, AsyncGenerator, Generator, List, Optional
 
 import paho.mqtt.client as mqtt
 import trio
+from paho.mqtt.client import MQTTMessage
 from paho.mqtt.properties import Properties
 from paho.mqtt.reasoncodes import ReasonCodes
 from trio import CancelScope, MemoryReceiveChannel, MemorySendChannel
 
-# TODO
-Message = Any
+Message = MQTTMessage
 
 
 class AsyncClient: