Add missing License and License URI headers in readme.txt

Author: wvega

jsfiddle-shortcode.php

@@ -15,7 +15,7 @@
  * Author:            Willington Vega
  * Author URI:        https://wvega.com/
  * License:           GPL-2.0+
- * License URI:       http://www.gnu.org/licenses/gpl-2.0.txt
+ * License URI:       https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
  */
 
 function jsfiddle_shortcode_handler($atts) {

readme.txt

@@ -5,6 +5,8 @@ Tags: jsfiddle
 Requires at least: 3.4.0
 Tested up to: 6.6.2
 Stable tag: 1.1.2
+License: GPL-2.0+
+License URI: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 
 Allows to easily embed Fiddles using a small shortcode.