shipping-notifications/ShippingNotifications/Model/ResourceModel/ShippingCategory/Collection.php

<?php

namespace Cpcommerce\ShippingNotification\Model\ResourceModel\ShippingCategory;

use \Magento\Framework\Model\ResourceModel\Db\Collection\AbstractCollection;

class Collection extends AbstractCollection
{
    protected function _construct()
    {
        $this->_init('Cpcommerce\ShippingNotifications\Model\ShippingCategory','Cpcommerce\ShippingNotifications\Model\ResourceModel\ShippingCategory');
    }
}