Support pyflakes 1.6.0
PyFlakes 1.6.0 was released today, it would be great if flake8 would support it.
Fake8 pins pyflakes < 1.6.0. I'm not sure if that was for any specific reason, if it was just a precaution, but I was able to run flake8 with pyflakes 1.6.0 without problem.
I'd like to be using v1.6.0 of pyflakes because it fixes a few bugs relating to static typing with python 3.6 that I have been encountering.