add http2 to 7.2 version

Author: Harvey

conf/nginx-site-ssl.conf

@@ -1,6 +1,6 @@
 server {
-	listen 443 ssl;
-  listen   [::]:443 ssl ipv6only=on; ## listen for ipv6
+	listen 443 ssl http2;
+        listen [::]:443 ssl https2 ipv6only=on; ## listen for ipv6
 
 	root /var/www/html;
 	index index.php index.html index.htm;