Git commits in Moodle 3.5.15 by Victor Deniz Falcon

commit ed815ecf42c4fd5dfe6e0ead1e231a9ff044547d
Author: Victor Deniz Falcon <victor@moodle.com>
Date:   Wed, 12 Aug 2020 00:07:34 +0800
Tag:    v3.5.15

MDL-52407 travis: use Travis default notifications(email)