Git commits in Moodle 3.6.x by eWallah

commit 534b0b61474f1252bac0ff842cdc025bd2e71023
Author: eWallah <info@eWallah.net>
Date:   Tue, 22 Jan 2019 22:47:14 +0800
Tag:    v3.6.3

MDL-63168 core_message: fix failures in migrate_message_data task.

commit d5e0ef78b1f59dcb115916bb41bef9fb596a6db8
Author: eWallah <info@eWallah.net>
Date:   Tue, 22 Jan 2019 18:39:36 +0800
Tag:    v3.6.3

MDL-64633 behat: fix FormatterNotFoundException when updating steps.