WordPress-Plugin-Boilerplate/plugin-name/trunk/uninstall.php

<?php
/**
 * Short Description (no period for file headers)
 *
 * Long Description.
 *
 * @link URL
 * @since x.x.x (if available)
 *
 * @package WordPress
 * @subpackage Component
 */

// If uninstall not called from WordPress, then exit.
if ( ! defined( 'WP_UNINSTALL_PLUGIN' ) ) {
	exit;
}