Git commits in Moodle 3.6.6 by Huong Nguyen

commit 95594d39df1101c082810da92efd731b71d4486f
Author: Huong Nguyen <huongnv13@gmail.com>
Date:   Wed, 26 Jun 2019 15:57:02 +0800
Tag:    v3.6.6

MDL-64258 Group: Performance problem on the enrol group members page


commit 7d58ebbb19acb23a8a30634d8a1e66da5ad1410e
Author: Huong Nguyen <huongnv13@gmail.com>
Date:   Wed, 26 Jun 2019 15:19:51 +0800
Tag:    v3.6.6

MDL-64258 Group: Unit Test for find_users function