Git commits in Moodle 3.4.4 by Victor Deniz

commit ab3759815a38c5249ac538e0b4283aac28f64a73
Author: Victor Deniz <victor@moodle.com>
Date:   Mon, 11 Jun 2018 23:33:31 +0800
Tag:    v3.4.4

MDL-62320 mimetypes: Add JSON to the default mime types list