Upgraded megalinter to 8.3.0 #803

Job	Run time
build-bash-docker-images (ubuntu, 4.4)	39s
build-bash-docker-images (ubuntu, 5.0)	36s
build-bash-docker-images (ubuntu, 5.3)	20s
build-bash-docker-images (alpine, 4.4)	22s
build-bash-docker-images (alpine, 5.0)	19s
build-bash-docker-images (alpine, 5.3)	19s
pre-commit	2m 47s
unit-tests (ubuntu, 4.4)	1m 34s
unit-tests (ubuntu, 5.0)	1m 33s
unit-tests (ubuntu, 5.3)	1m 22s
unit-tests (alpine, 4.4)	1m 34s
unit-tests (alpine, 5.0)	1m 32s
unit-tests (alpine, 5.3)	1m 32s
Overall Tests Results	3s
	14m 32s

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