PEP 530 consequences

[Matthieu Dartiailh]

PEP 530 introduced asynchronous comprehensions in Python 3.6 which led to the addition of the is_async argument to to the comprehension node.

[Thomas Kluyver]

Thanks for the heads up. I imagine there will be a few other changes as well, like f strings and variable annotations. I haven't gotten a chance to play much with 3.6 yet.

[Matthieu Dartiailh]

resolved by https://bitbucket.org/takluyver/greentreesnakes/pull-requests/4