Add empty py.typed

Author: Juergen Skrotzky

deepdiff/py.typed

@@ -36,6 +36,7 @@ def get_reqs(filename):
       author_email='[email protected]',
       license='MIT',
       packages=['deepdiff'],
+      package_data={"deepdiff": ["py.typed"]},
       zip_safe=True,
       include_package_data=True,
       long_description=long_description,