Git commits in Moodle 3.5.8 by Andrew Madden

commit c7f46956d471bde97f6448ebee720a07e437de1e
Author: Andrew Madden <andrew.madden@live.com.au>
Date:   Tue, 18 Jun 2019 09:58:31 +0800
Tag:    v3.5.8

MDL-65926 moodlelib: Convert username to lowercase prior to SQL query