Git commits in Moodle 3.5.11 by Sam Hemelryk

commit 89fb92a5513012023339b1ce8378577129c662cd
Author: Sam Hemelryk <sam.hemelryk@totaralearning.com>
Date:   Tue, 15 Oct 2019 12:28:25 +0800
Tag:    v3.5.11

MDL-67175 mod_scorm: sync XHR requests use sendBeacon when available