Add mypy-data to typeshed

[henryJack]

It would be great if you could add your numpy stubs to Typeshed.

https://github.com/python/typeshed/tree/master/stdlib/2and3

You have already written the most useful parts of the numpy stub and could just use stubgen to complete the stub file...

https://github.com/ashleyh/mypy-stubgen

[brettcannon]

Typeshed was recently updated to allow third-party contributions without explicit upstream project approval, so this should be doable without requiring NumPy's sign-off.