Git commits in Moodle 3.6.3 by Juan Leyva

commit 181e04ce5d1aa2e05e2fc317e508387cebf955a1
Author: Juan Leyva <juanleyvadelgado@gmail.com>
Date:   Wed, 06 Feb 2019 18:18:15 +0800
Tag:    v3.6.3

MDL-64791 messages: Bring back 'messagecontactrequests' message

commit ff28d273e0b582f7a12bab8d398706b379240b28
Author: Juan Leyva <juanleyvadelgado@gmail.com>
Date:   Wed, 30 Jan 2019 22:07:58 +0800
Tag:    v3.6.3

MDL-64444 mod_assign: Use correct permissions for context locking

commit e76b511228ec72dc98a93279e66bda8b26209342
Author: Juan Leyva <juanleyvadelgado@gmail.com>
Date:   Fri, 16 Nov 2018 22:48:39 +0800
Tag:    v3.6.3

MDL-62668 mod_workshop: Return feedback for reviewer in assessment phase