Git commits in Moodle 3.3.6 by Dan Marsden

commit bdb58432909f279b8aedfffb1324bbe656b07142
Author: Dan Marsden <dan@danmarsden.com>
Date:   Thu, 15 Mar 2018 08:28:07 +0800
Tag:    v3.3.6

MDL-59857 mod_scorm: use valid length for grade type field.