Git commits in Moodle 3.5.3 by Pavel Sokolov

commit 6e2fc5e5e1e608e357b2b5c256b18472f7f19134
Author: Pavel Sokolov <pavel.m.sokolov@gmail.com>
Date:   Tue, 14 Aug 2018 22:18:55 +0800
Tag:    v3.5.3

MDL-63130 message: message_count_unread_message counts sent messages