Git commits in Moodle 3.6.8 by Eloy Lafuente (stronk7)

commit 08c86b9e9bb0e5f7af4fceffa56274d2cba4e029
Author: Eloy Lafuente (stronk7) <stronk7@moodle.org>
Date:   Fri, 22 Nov 2019 07:17:05 +0800
Tag:    v3.6.8

weekly release 3.6.7+

commit 1f2d7d154afb75ddd8599425ed0f169600897450
Author: Eloy Lafuente (stronk7) <stronk7@moodle.org>
Date:   Thu, 21 Nov 2019 19:31:43 +0800
Tag:    v3.6.8

MDL-48024 quiz: return void is only php >= 71