Update ch.yaml

Ticino was missing from the Neujahrstag observing cantons list.

See page 26 of http://www.ejpd.admin.ch/content/dam/data/staat_buerger/zivilprozessrecht/kant-feiertage.pdf
Merge branch 'patch-2' of https://github.com/jg/holidays into jg-patch-2
Update Swiss refs

Re: Ticino was missing from the Neujahrstag observing cantons list.