fix(Mypy): add support for type checking #60

Job	Run time
test / prepare / prepare	15s
test / checkers	15s
test / test-repository / test-python (ubuntu-latest)	45s
test / test-repository / test-python (windows-latest)	1m 29s
test / test-repository / test-npm (windows-latest)	50s
test / test-repository / test-npm (ubuntu-latest)	18s
test / semantic-commit / semantic-commit	21s
test / test-repository / test-docker	0s
test / release / release	3s
test / deploy-repository / release-npm	19s
test / deploy-repository / release-docker	0s
test / deploy-repository / release-python	28s
test / deploy-repository / notify / notify	4s
	5m 7s

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