docs: update project URL (#413)

Author: tswast

setup.py

@@ -39,7 +39,7 @@
     author_email="[email protected]",
     description="Google Authentication Library",
     long_description=long_description,
-    url="https://github.com/GoogleCloudPlatform/google-auth-library-python",
+    url="https://github.com/googleapis/google-auth-library-python",
     packages=find_packages(exclude=("tests*", "system_tests*")),
     namespace_packages=("google",),
     install_requires=DEPENDENCIES,