Merge pull request #320 from kabalin/stylelint #711

Job	Run time
CI test (make validate)	58s
Code coverage (codecov)	1m 22s
Build moodle-plugin-ci.phar	27s
Integration tests (8.3, main, true)	6m 43s
Integration tests (8.3, MOODLE_405_STABLE, true)	6m 48s
Integration tests (8.3, MOODLE_404_STABLE, true)	6m 27s
Integration tests (8.2, MOODLE_403_STABLE, true)	6m 18s
Integration tests (8.2, MOODLE_402_STABLE, true)	5m 57s
Integration tests (8.1, MOODLE_401_STABLE, true)	6m 58s
Integration tests (8.0, MOODLE_400_STABLE)	5m 50s
Integration tests (8.0, MOODLE_311_STABLE)	5m 16s
Integration tests (7.4, MOODLE_39_STABLE)	4m 45s
SelfUpdate tests (PHAR) (8.3)	32s
SelfUpdate tests (PHAR) (8.2)	37s
Integration tests (PHAR) (8.3, main, true)	6m 9s
SelfUpdate tests (PHAR) (8.1)	18s
SelfUpdate tests (PHAR) (8.0)	27s
Integration tests (PHAR) (8.3, MOODLE_405_STABLE, true)	6m 21s
SelfUpdate tests (PHAR) (7.4)	10s
Integration tests (PHAR) (8.3, MOODLE_404_STABLE, true)	5m 51s
Integration tests (PHAR) (8.2, MOODLE_403_STABLE, true)	5m 53s
Integration tests (PHAR) (8.1, MOODLE_402_STABLE, true)	5m 24s
Integration tests (PHAR) (8.0, MOODLE_401_STABLE, true)	6m 6s
Integration tests (PHAR) (7.4, MOODLE_400_STABLE)	5m 0s
	1h 40m 37s

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