Git commits in Moodle 3.9.4 by Sam Hemelryk

commit 3e9dadc85ee9a61a80e512c83c267299c53f1c2a
Author: Sam Hemelryk <sam.hemelryk@totaralearning.com>
Date:   Wed, 19 Aug 2020 13:10:30 +0800
Tag:    v3.9.4

MDL-68896 mod_scorm: improved sendBeacon use when unloading