Git commits in Moodle 3.5.6 by Brendan Heywood

commit d6455734d81410eda2d103d1c8522da0dfba27d8
Author: Brendan Heywood <brendan@catalyst-au.net>
Date:   Fri, 14 Dec 2018 11:43:02 +0800
Tag:    v3.5.6

MDL-64394 core: Fixed bug when using access log with pre_loginpage_hook