fix(Mypy): add support for type checking #64

Job	Run time
test / prepare / prepare	20s
test / checkers	19s
test / test-repository / test-python (windows-latest)	1m 26s
test / test-repository / test-python (ubuntu-latest)	44s
test / test-repository / test-npm (ubuntu-latest)	13s
test / test-repository / test-npm (windows-latest)	50s
test / semantic-commit / semantic-commit	20s
test / test-repository / test-docker	0s
test / release / release	4s
test / deploy-repository / release-npm	22s
test / deploy-repository / release-python	33s
test / deploy-repository / release-docker	0s
test / deploy-repository / notify	0s
	5m 11s

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