enforce typed defs, fix type hint

[le91688]

No description provided.

[chris-zetier]

Summary of changes

strict_optional -> deleted and thus the default value = true (already was)
check_untyped_defs -> deleted. (default value = false)
disallow_untyped_calls -> deleted. (default value = false) (already was)
warn_redundant_casts -> deleted. (default value = false)
disallow_untyped_defs -> Changed from False to True

And thus exposed a syntax error and later incompatible type::
src/lariat/lariat.py:184: error: Function is missing a type annotation for one or more arguments
Found 1 error in 1 file (checked 2 source files)
Fixing this we get type "Optional[Set[Any]]"; expected "Optional[List[str]]"

And you applied the fix which fixed this. Nice.

[mypy-bravado.client.]
[mypy-bravado.docstring_property.]
[mypy-bravado.swagger_model.*]
sections deleted, probably because the imported bravado.client did not pass the mypy check. But looks like these were not necessary..