Otherwise with the following example:

    bus = await jeepney.io.asyncio.open_dbus_connection()
    message = await bus.receive()

I've been getting this:

    RuntimeError: read() called while another coroutine is already waiting for incoming data

asyncio: add async context manager interface to DBusConnection

See merge request !27

asyncio: fix .receive() immediately after open_dbus_connection()

See merge request !26