Method handleSubtitle

/**
 * Method to handle the `<subtitle>` element for the feed.
 *
 * @param   Feed               $feed  The Feed object being built from the parsed feed.
 * @param   \SimpleXMLElement  $el    The current XML element object to handle.
 *
 * @return  void
 *
 * @since   3.1.4
 */
protected function handleSubtitle(Feed $feed, \SimpleXMLElement $el)
{
    $feed->description = $this->inputFilter->clean((string) $el, 'html');
}