[code-quality] Flake8 User Survey

Hey all, Flake8 3.0 is close to having a beta release (and therefore a final release). Before that, I need some more information about the last three things we need to implement. As such, I've made a survey to find out what I can simplify for 3.0: http://goo.gl/forms/xiC7dt23RuGavESu1 Cheers, Ian