Async methods with @method

[thusser]

Am I missing something or is it not possible to decorate async methods with @method? The wrapped method here is not marked async:
https://github.com/altdesktop/python-dbus-next/blob/master/dbus_next/service.py#L90
Should be easy to check, whether fn is a coroutine or not and then either provide an async or normal version of wrapped. Want a PR?

[jonasBoss]

It is already possible using the aio MessageBus. If you are curious why:

python-dbus-next/dbus_next/aio/message_bus.py

Line 345 in ab566e1

if not asyncio.iscoroutinefunction(method.fn):