Merge pull request #1521 from scottilee/python2support

Require python3

Author: k8s-ci-robot

setup.py

@@ -64,6 +64,7 @@
               'kubernetes.dynamic', 'kubernetes.leaderelection'],
     include_package_data=True,
     long_description="Python client for kubernetes http://kubernetes.io/",
+    python_requires='>=3.6',
     classifiers=[
         "Development Status :: %s" % DEVELOPMENT_STATUS,
         "Topic :: Utilities",