Workday sensor: Switzerland/CH not a valid option

Hi

Is there a reason why Switzerland and CH are not valid options for the workday sensor?

At a quick glance it seems to be the only country that’s avaible in holidays 0.9.4 but not in components/binary_sensor/workday.py from Home Assistant 0.66.0.

https://github.com/home-assistant/home-assistant/pull/13630