http://steamcommunity.com/app/210970/discussions/0/458607699607692822/

I am a bit sad that they don't have better patch notes available.

Also: "4 February 2016, 7:55pm: We are switching to a system where patch notes are listed in the News tab instead, since that is more traditional. Un-pinning this list since it is no longer up to date."

So the go-to place should be:

https://steamcommunity.com/app/210970/announcements/

but theres even less info there :/