Git commits in Moodle 3.1.9 by Marina Glancy

commit 58643c8b113649257fedfaa4ffb572b100c11484
Author: Marina Glancy <marina@moodle.com>
Date:   Mon, 23 Oct 2017 14:16:57 +0800
Tag:    v3.1.9

MDL-60543 env: Moodle 3.2 and 3.3 do no support PHP7.2