[code-quality] question on flake8 @2.5.4: pyflakes version constraint

[petr]

Hi, 

The current flake8 constrains the version of pyflakes to < 1.1 ("pyflakes >= 0.8.1, < 1.1”). Now, pyflakes was updated to 1.1. So could the requirements constraint of flake8 be bumped safely?

Thanks!
~petr