What's new in this version:
*) mod_http2: added donated HTTP/2 implementation via core module. Similar configuration options to mod_ssl.]
*) mod_proxy: don't recyle backend announced "Connection: close" connections to avoid reusing it should the close be effective after some new request is ready to be sent.
*) mod_substitute: Allow to configure the patterns merge order with the new SubstituteInheritBefore on|off directive.
*) mod_proxy: Fix ProxySourceAddress binding failure with AH00938.