Explicitly add py.typed to package_data

Author: mpkocher

setup.py

@@ -42,6 +42,7 @@ def get_version():
       python_requires=">=3.7",
       install_requires=_get_requirements("REQUIREMENTS.txt"),
       packages=['pydantic_cli', 'pydantic_cli.examples'],
+      package_data={"pydantic_cli": ["py.typed"]},
       tests_require=_get_requirements("REQUIREMENTS-TEST.txt"),
       extras_require={"shtab": "shtab>=1.3.1"},
       zip_safe=False,