Add python setup.py check to lint
diff --git a/setup.py b/setup.py
index 32c5d02..615753d 100644
--- a/setup.py
+++ b/setup.py
@@ -35,6 +35,7 @@
     author_email='jonwayne+google-auth@google.com',
     description='Google Authentication Library',
     long_description=long_description,
+    url='https://github.com/GoogleCloudPlatform/google-auth-library-python',
     packages=find_packages(exclude='tests'),
     namespace_packages=('google',),
     install_requires=DEPENDENCIES,