So far, it has been tested with a Yubikey NEO on a MacBook Pro running macOS Catalina. I have no other devices to test with, but bug reports and patches may still be reviewed.
This uses [deanishe/awgo](https://github.com/deanishe/awgo) to interface with Alfred and [yawn/ykoath](https://github.com/yawn/ykoath) for interracting with the Yubikey