Readme.txt update and Screenshot-1

Author: stevenkword

assets/screenshot-1.png

@@ -21,7 +21,7 @@ This plugin will lint theme and plugin code inside your WordPress file system an
 
 **This plugin relies on WP-Cron to scan files in the background. The scan will get stuck if the site's WP-Cron isn't running correctly. Please see the [FAQ](https://wordpress.org/plugins/php-compatibility-checker/faq/) for more information.**
 
-= Update to PHP 7 =
+= Update to PHP 7.2 =
 * Use this plugin to check your site for compatibility up to PHP 7.2!
 * As of [November 2016](https://wordpress.org/about/stats/), 52.9% of WordPress websites run a PHP version less PHP 5.5.
 * These versions of PHP have been deprecated and unsupported for over 9 months.