Support for Keyspan USA-19HS

[arrowmaster]

While not compact or cheap, the Keyspan USA-19HS is a GOAT among USB to Serial devices because it works with picky serial devices when others don't.

I could not find any indication this library supports the Keyspan devices. They are well supported by the Linux kernel and you can find the implementation at https://github.com/torvalds/linux/blob/master/drivers/usb/serial/keyspan.c

[kai-morich]

This device is not supported. It needs a dedicated driver. Feel free to contribute.