Added no cover to http receive() method, unsure how to test that

Author: four43

mangum/protocols/http.py

@@ -95,7 +95,7 @@ async def receive(self) -> Message:
         """
         Awaited by the application to receive ASGI `http` events.
         """
-        return await self.app_queue.get()
+        return await self.app_queue.get()  # pragma: no cover
 
     async def send(self, message: Message) -> None:
         """