Prepare for 4.1.8 release #508

Job	Run time
CI test (make validate)	36s
Code coverage (codecov)	32s
Integration tests (8.2, master)	6m 16s
Build moodle-plugin-ci.phar	39s
Integration tests (8.2, MOODLE_403_STABLE)	7m 46s
Integration tests (8.2, MOODLE_402_STABLE)	6m 4s
Integration tests (8.1, MOODLE_401_STABLE)	7m 24s
Integration tests (8.0, MOODLE_400_STABLE)	6m 32s
Integration tests (8.0, MOODLE_311_STABLE)	7m 18s
Integration tests (7.4, MOODLE_310_STABLE)	7m 14s
Integration tests (7.4, MOODLE_39_STABLE)	5m 59s
Integration tests (7.4, MOODLE_38_STABLE)	6m 12s
Integration tests (PHAR) (8.2, master)	6m 10s
Integration tests (PHAR) (8.1, MOODLE_403_STABLE)	6m 21s
Integration tests (PHAR) (8.0, MOODLE_401_STABLE)	7m 54s
Integration tests (PHAR) (7.4, MOODLE_400_STABLE)	7m 18s
	1h 30m 15s

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