Migration for updating Retour widget from Craft 2

m190416_110112_update_retour_widget_type.php

<?php

namespace craft\contentmigrations;

use Craft;
use craft\db\Migration;
use nystudio107\retour\widgets\RetourWidget;

/**
 * m190416_110112_update_retour_widget_type migration.
 *
 * Update retour widget type, as the plugin itself doesn't handle this currently
 *
 */
class m190416_110112_update_retour_widget_type extends Migration
{
    /**
     * @inheritdoc
     */
    public function safeUp()
    {
	    echo "    > Updating Retour widget type\n";

	    $this->update('{{%widgets}}', [
		    'type' => RetourWidget::class
	    ], ['type' => 'Retour']);

	    return true;
    }

    /**
     * @inheritdoc
     */
    public function safeDown()
    {
        echo "m190416_110112_update_retour_widget_type cannot be reverted.\n";
        return false;
    }
}