v2.0.0 🎉

Please read the upgrade guide to learn how to upgrade: https://github.com/graphql-python/graphene/blob/master/UPGRADE-v2.0.md

• Simpler Graphene types implementation (thanks to __init_subclass__, and a polyfill implementation for Python 2).
• Simplified resolver API
• Type Options from class arguments (only available in Python 3)

And...
Subscriptions!!