Dev
minor, output thumbprint
add _utc_date function
And generate error if nothing to do at remote server.
exe mode
add note info if netcat-openbsd is required.
fix https://github.com/Neilpang/acme.sh/issues/578
support openssl 1.1.0
Add FreeDNS plugin support to acme.sh
Added support for Linode DNS API.