Added Reset Postdata Hook

* https://wordpress.tv/2017/08/11/amanda-giles-level-up-taking-your-wordpress-code-up-a-notch/ mentions needing to reset postdata. Unsure if this is necessary the way we use WP_Query, but better to be safe than sorry

index.php

@@ -4,7 +4,7 @@
 Plugin URI: http://www.codesign2.co.uk
 Description: Bring your content authoring and tooling into the 21st century with this tool.
 Author: CODESIGN2
-Version: 2.6.2
+Version: 2.6.4
 Author URI: http://www.codesign2.co.uk/
 License: AGPL
 */
@@ -103,6 +103,7 @@ public function render_sc( $atts, $content='', $tag=self::POST_TYPE ) {
             }
         }
         wp_reset_query();
+	wp_reset_postdata();
         return $out;
     }