re-add package data for py.typed

Need for pypi install?

setup.py

@@ -94,6 +94,7 @@ def build_py_modules(basedir, excludes=()):
     license="BSD",
     url="https://github.com/gitpython-developers/GitPython",
     packages=find_packages(exclude=("test.*")),
+    package_data={'git': ['**/*.pyi', 'py.typed']},
     include_package_data=True,
     py_modules=build_py_modules("./git", excludes=["git.ext.*"]),
     package_dir={'git': 'git'},