You’re right, that section of the README needs to be updated. The website’s source is not available, but what change(s) would you like to see?
Ah okay. I wanted to update the https://caddyserver.com/docs/automatic-https 's Enabling the DNS Challenge for Azure with these environment variables https://godoc.org/github.com/xenolf/lego/providers/dns/azure#NewDNSProvider
Cool. I just took care of it. It will be updated at the next release. Thanks!