Integration into Caddy and go libdns

I've written a small wrapper around your acme4netvs tools to integrate them into Caddy and go's libdns. I think this may be useful to other people as well. Please find the code in the attached repository:

https://gitlab.kit.edu/thilo.krumrey/caddy-netvs

As I'm not that great with go, I wanted to ask if you'd want to take this over?