Fix failure in monitoring events

Author: mksong76

iconsdk/async_service.py

@@ -376,6 +376,6 @@ async def get_network_info(self) -> Any:
 
 
     async def monitor(self, spec: MonitorSpec, keep_alive: Optional[float] = None) -> AsyncMonitor:
-        return self.__provider.make_monitor(spec, keep_alive)
+        return await self.__provider.make_monitor(spec, keep_alive)
 
 __all__ = ['AsyncIconService']