mypy linting support #178
Description
Running mypy in a project that uses ghapi results in this error:
foo.py:14: error: Skipping analyzing "ghapi.all": module is installed, but missing library stubs or py.typed marker [import-untyped]
foo.py:14: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
ghapi seems to have types already, so all that is missing is a py.typed marker.