Git commits in Moodle 3.5.5 by Viktor

commit 427463a52574e4b3bcbe1c65c49066438770641e
Author: Viktor <viktor.khokhryakov@gmail.com>
Date:   Mon, 04 Feb 2019 16:10:25 +0800
Tag:    v3.5.5

MDL-62702 core_lib: fix broken verification signature