jerome-rdlv

<?php

/**
 * This file can be dropped in wp-content/mu-plugins/ to be activated.
 * It will add post thumbnails to the RSS feed.
 * The image can then be used in MailChimp templates with the *|RSSITEM:IMAGE|* merge tag.
 * This implementation is based on useful indications by [vick](https://stackoverflow.com/a/48549541)
 */

// add xml namespace for media element