Add CODECOV_TOKEN #553

Job	Run time
Code coverage (codecov)	29s
CI test (make validate)	32s
Build moodle-plugin-ci.phar	39s
Integration tests (8.2, main)	6m 19s
Integration tests (8.2, MOODLE_403_STABLE)	5m 56s
Integration tests (8.2, MOODLE_402_STABLE)	5m 45s
Integration tests (8.1, MOODLE_401_STABLE)	6m 52s
Integration tests (8.0, MOODLE_400_STABLE)	6m 36s
Integration tests (8.0, MOODLE_311_STABLE)	5m 50s
Integration tests (7.4, MOODLE_39_STABLE)	6m 3s
Integration tests (PHAR) (8.2, main)	5m 40s
Integration tests (PHAR) (8.1, MOODLE_403_STABLE)	5m 25s
Integration tests (PHAR) (8.0, MOODLE_401_STABLE)	6m 22s
Integration tests (PHAR) (7.4, MOODLE_400_STABLE)	5m 44s
	1h 8m 12s

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