Git commits in Moodle 3.4.5 by Dan Poltawski

commit 8252dfbd00ee3fa1f5d2ea0786e0c6169be11c24
Author: Dan Poltawski <talktodan@gmail.com>
Date:   Fri, 31 Aug 2018 18:35:12 +0800
Tag:    v3.4.5

MDL-48846 filter: Stop reffering to invalid moodle.org/download/mimetex