Git commits in Moodle 3.5.13 by Tim Hunt

commit b10488d1340978e3e0aad7a5fbbb376a057c8113
Author: Tim Hunt <T.J.Hunt@open.ac.uk>
Date:   Tue, 19 May 2020 05:55:50 +0800
Tag:    v3.5.13

MDL-68733 quiz editing: behat test for altering random question tags