fix(Mypy): add support for type checking #84

Job	Run time
test / prepare / prepare	14s
test / checkers	20s
test / test-repository / test-python (ubuntu-latest)	51s
test / test-repository / test-python (windows-latest)	1m 16s
test / test-repository / test-npm (windows-latest)	1m 6s
test / test-repository / test-npm (ubuntu-latest)	14s
test / test-repository / test-docker	0s
test / semantic-commit / semantic-commit	29s
test / release / release	4s
test / deploy-repository / release-docker	0s
test / deploy-repository / release-npm	21s
test / deploy-repository / release-python	47s
test / deploy-repository / notify / notify	4s
	5m 46s

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