docker-nginx-ssl-proxy

Merge pull request #31 from mattbaylor/patch-1

Update SHA256 Hash for new Cloudflare IPv4 Range

Merge pull request #23 from claytondaley/verify-dns

Improve messages.

Ensure that something is responding at the target domain before proceeding to let's encrypt verification (to avoid rate limits, see issue #19). Note that `dns-servers` flag would be ideal but is not available.