fix(Mypy): add support for type checking #68

Job	Run time
test / prepare / prepare	11s
test / checkers	19s
test / test-repository / test-npm (windows-latest)	45s
test / test-repository / test-python (windows-latest)	1m 8s
test / test-repository / test-python (ubuntu-latest)	43s
test / test-repository / test-npm (ubuntu-latest)	20s
test / semantic-commit / semantic-commit	19s
test / test-repository / test-docker	-1s
test / release	0s
test / deploy-repository	-1s
	3m 43s

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