Add ast36

[telendt]

I've just tried mypy --fast-parser --python-version 3.6 on code that utilizes some new Python 3.6 features and it failed.

Breaking features:

• formatted string literals, PEP 498 -- error: invalid syntax
• asynchronous generators, PEP 525 -- error: 'yield' in async function
• asynchronous comprehensions, PEP 530 -- error: invalid syntax

[ddfisher]

Thanks for the bug report. I'm planning on working on full 3.6 support in the next week or two (and documenting how typed_ast will be updated for new Python releases).

[refi64]

F-string are in #22... still... ;)

[JelleZijlstra]

I don't think async generators and comprehensions need further work in typed_ast. I have a pending pull request to mypy (python/mypy#2711) to add async generators, and it didn't require typed_ast changes. Async comprehensions work fine for me with the latest release of mypy.

[ddfisher]

Fixed as of 1.0.0! Mypy support pending here: python/mypy#2857.