Prepare for 4.1.6 release #490

Job	Run time
Code coverage (codecov)	39s
CI test (make validate)	40s
Build moodle-plugin-ci.phar	38s
Integration tests (8.2, master)	6m 14s
Integration tests (8.2, MOODLE_402_STABLE)	6m 35s
Integration tests (8.1, MOODLE_401_STABLE)	8m 26s
Integration tests (8.0, MOODLE_400_STABLE)	8m 6s
Integration tests (8.0, MOODLE_311_STABLE)	8m 14s
Integration tests (7.4, MOODLE_310_STABLE)	8m 12s
Integration tests (7.4, MOODLE_39_STABLE)	5m 58s
Integration tests (7.4, MOODLE_38_STABLE)	6m 18s
Integration tests (PHAR) (8.2, master)	6m 15s
Integration tests (PHAR) (8.1, MOODLE_402_STABLE)	5m 51s
Integration tests (PHAR) (8.0, MOODLE_401_STABLE)	6m 43s
Integration tests (PHAR) (7.4, MOODLE_400_STABLE)	6m 13s
	1h 25m 2s

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