meet requirements for "http-01" ACME challenge implementation
Ponzu's ACME implementation to integrate with Let's Encrypt needed to be updated (based on the acme/autocert package) to meet the required "http-01" challenge. For more background, read: https://community.letsencrypt.org/t/2018-01-11-update-regarding-acme-tls-sni-and-shared-hosting-infrastructure/50188