Add changelog entry for v5.0-r3 #119

Job	Run time
call / setup_jobs	4s
call / sync_pull_request_template	4s
call / static (8.3, MOODLE_500_STABLE, pgsql)	52s
call / test (8.1, MOODLE_401_STABLE, pgsql)	2m 42s
call / test (8.1, MOODLE_405_STABLE, mariadb)	1m 52s
call / test (8.3, MOODLE_404_STABLE, pgsql)	2m 7s
call / test (8.0, MOODLE_401_STABLE, pgsql)	2m 54s
call / test (8.2, MOODLE_405_STABLE, pgsql)	2m 14s
call / test (8.1, MOODLE_404_STABLE, pgsql)	2m 9s
call / test (8.1, MOODLE_405_STABLE, pgsql)	2m 22s
call / test (8.1, MOODLE_405_STABLE, mysqli)	2m 30s
call / test (8.2, MOODLE_405_STABLE, mariadb)	2m 7s
call / test (8.2, MOODLE_500_STABLE, mysqli)	2m 23s
call / test (8.3, MOODLE_500_STABLE, pgsql)	2m 10s
call / test (8.2, MOODLE_404_STABLE, pgsql)	2m 2s
call / test (8.4, MOODLE_500_STABLE, mariadb)	2m 16s
call / test (8.2, MOODLE_500_STABLE, pgsql)	2m 3s
call / test (8.3, MOODLE_500_STABLE, mysqli)	2m 28s
call / test (8.3, MOODLE_405_STABLE, mysqli)	2m 35s
call / test (8.2, MOODLE_500_STABLE, mariadb)	1m 54s
call / test (8.2, MOODLE_405_STABLE, mysqli)	2m 35s
call / test (8.3, MOODLE_500_STABLE, mariadb)	1m 59s
call / test (8.3, MOODLE_405_STABLE, pgsql)	2m 9s
call / test (8.3, MOODLE_405_STABLE, mariadb)	2m 8s
call / test (8.4, MOODLE_500_STABLE, pgsql)	2m 5s
call / test (8.4, MOODLE_500_STABLE, mysqli)	2m 20s
	53m 4s

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