Use nvm 0.39.7 #109

Job	Run time
CI test (make validate)	1m 10s
Code coverage (codecov)	0s
Build moodle-plugin-ci.phar	28s
Integration tests (8.3, main, true)	1m 21s
Integration tests (8.3, MOODLE_404_STABLE, true)	2m 2s
Integration tests (8.2, MOODLE_403_STABLE, true)	1m 25s
Integration tests (8.2, MOODLE_402_STABLE, true)	1m 37s
Integration tests (8.1, MOODLE_401_STABLE, true)	1m 21s
Integration tests (8.0, MOODLE_400_STABLE)	1m 33s
Integration tests (8.0, MOODLE_311_STABLE)	1m 7s
Integration tests (7.4, MOODLE_39_STABLE)	59s
SelfUpdate tests (PHAR) (8.3)	31s
Integration tests (PHAR) (8.3, main, true)	1m 18s
SelfUpdate tests (PHAR) (8.2)	29s
Integration tests (PHAR) (8.3, MOODLE_404_STABLE, true)	1m 31s
Integration tests (PHAR) (8.2, MOODLE_403_STABLE, true)	1m 39s
SelfUpdate tests (PHAR) (8.1)	22s
Integration tests (PHAR) (8.1, MOODLE_402_STABLE, true)	1m 7s
SelfUpdate tests (PHAR) (8.0)	28s
Integration tests (PHAR) (8.0, MOODLE_401_STABLE, true)	1m 23s
SelfUpdate tests (PHAR) (7.4)	17s
Integration tests (PHAR) (7.4, MOODLE_400_STABLE)	1m 3s
	23m 11s

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