`asyncore` library is removed in Python 3.12

Mostly posting this for anyone interested in using this or finding issues with it, but the used `asyncore` library was deprecated and finally removed by Python 3.12. `asyncore` is used by imported library [`pyinotify`](https://github.com/seb-m/pyinotify/issues/204). You (the end user and the repo owner) can fix this by adding `pyasyncore` to your dependencies.