Update nginx-sample.conf (#175)

Now we prevent access to system directory and update php version.

nginx-sample.conf

@@ -4,6 +4,15 @@ server {
 	index index.php;
 	server_name your-domain.com;
 	
+	location ~ /system {
+		deny all;
+		return 404;
+	}
+
+	location ~ /\.ht {
+		deny all;
+	}
+
 	location / {
 		try_files $uri $uri/ /index.php;
 	}
@@ -11,15 +20,6 @@ server {
 	location ~ \.php$ {
 		include snippets/fastcgi-php.conf;
 		fastcgi_read_timeout 240;
-                fastcgi_pass unix:/var/run/php/php7.2-fpm.sock;
-        }
-
-        location ~ /\.ht {
-                deny all;
-        }
-
-        location /system {
-           deny all;
-           return 404;
+		fastcgi_pass unix:/var/run/php/php7.3-fpm.sock;
 	}
 }