Git commits in Moodle 3.8.x by Adrian Hutchinson

commit 80f4ad43b892beb2be9ea2c59c2fda4062691315
Author: Adrian Hutchinson <adrian.hutchinson@mheducation.com>
Date:   Tue, 18 Feb 2020 01:25:14 +0800
Tag:    v3.8.2

MDL-67988 mod_lti: remove padding from JWS base64url encoding