Windows - coroutine issue

I got the following error in python3.12 on windows:

````
  File "D:\mdeweerd\workspace\serial\captureSerial.py", line 101, in read_port        
    async with open_serial_connection(url=port, baudrate=115200) as (reader, _):      
TypeError: 'coroutine' object does not support the asynchronous context manager protocol
```

I'll try #91 .