Git commits in Moodle 3.5.6 by Sara Cenni

commit 2653ea76becfb964d250efd931ad59276d34db47
Author: Sara Cenni <sara.cenni@unibo.it>
Date:   Thu, 21 Mar 2019 17:41:53 +0800
Tag:    v3.5.6

MDL-64851 badge: reviewing badges of invisible courses