• lib: Add nghttp2_session_set_user_data() public API function (GH-1137)
• src: Define nghttp2_inet_pton wrapper to avoid inet_pton macro (GH-1128)
• nghttpx: Close listening socket on graceful shutdown
• nghttpx: Add an option to accept expired client certificate (GH-1126)
• nghttpx: Add mruby tls_client_not_before, and tls_client_not_after (GH-1123)
• nghttpx: Fix potential memory leak