v2.0.0-beta.2

• [BREAKING] subscribe option is deprecated. Use the $subscribe option instead.
• [BREAKING] watchLoading was incorrectly named loadingChangeCb in the code. It is now watchLoading as it was stated in the doc.
• [BREAKING] Removed addGraphQLSubscriptions from the package, since it is now exposed in subscriptions-transport-ws.
• Compatibility with [email protected].
• New subscribeToMore feature on queries.
• Data properties implicitly created in the apollo options are now shown in the vue devtools.