Git commits in Moodle 3.6.2 by Sara Cenni

commit 9d235abdb4b86ef2b516d41c034d248d3e4dbd2e
Author: Sara Cenni <sara.cenni@unibo.it>
Date:   Mon, 17 Dec 2018 18:22:27 +0800
Tag:    v3.6.2

MDL-64345 core: Make FB logo upgrade cross-DB compatible