• Domain names in <MDomain ...> can now appear in quoted form. Fixes #257
• Fixed a failure in ACME challenge selection that aborted further searches
  when the tls-alpn-01 method did not seem to be suitable. See #255
• Changed the tls-alpn-01 setup to only become unsuitable when none of the
  dns names showed support for a configured 'Protocols ... acme-tls/1'. This
  allows use of tls-alpn-01 for dns names that are not mapped to a VirtualHost.
• Removed the old mod_ssl interworking code. The module now requires a
  Apache httpd 2.4.48 or newer.
• Fixed a potential null pointer dereference if ACME/OCSP server returned
  2xx responses without content type. Reported by chuangwen.