called constructor method deprecated

If I deploy the plugin while I have WP_Debug set to true: admin screens are plastered with this notice:

Notice: The called constructor method for WP_Widget is <strong>deprecated</strong> since version 4.3.0! Use <pre>__construct()</pre> instead. in /var/www/piratesbreakdown/wp-includes/functions.php on line 3457

This isn’t critical: it’s just a notice and won’t effect production hosts. Still, it’s a bit annoying.

Thank you.

https://wordpress.org/plugins/featured-post/