Git commits in Moodle 3.8.2 by Michael Milette

commit 8b466d280395b905618ccc95a8a1a2d1af96626f
Author: Michael Milette <michael.milette@tngconsulting.ca>
Date:   Tue, 14 Jan 2020 05:19:31 +0800
Tag:    v3.8.2

MDL-66858 master: Enable <header> tags in Atto editor.