Git commits in Moodle 3.5.5 by Toni Barberà Melià

commit 365435182e6529759e9ed94bcf8590035f2331a1
Author: Toni Barberà Melià <toni@moodle.com>
Date:   Tue, 18 Sep 2018 20:58:27 +0800
Tag:    v3.5.5

MDL-63706 tasks: added new config parameter. changes in cron execution