Fix flake8 dependency for dev environment

[dbohomiakov]

Long story short

There is an inconsistency in the requirements files. In the requirements/ci-wheel.txt explicitly defined pyflakes with version 2.0.0 but flake8 which uses pyflakes as dependency requires version from the range >= 1.5.0, < 1.7.0. The newest version overwrites the required one.

Expected behaviour

Actual behaviour

Steps to reproduce

pip install -r requirements/dev.txt

Your environment

MacOS 10.14, python 3.6.5, aiohttp 3.4.4
both

[aio-libs-bot]

GitMate.io thinks the contributor most likely able to help you is @asvetlov.

Possibly related issues are #1485 (Fix broken Cookies support), #318 (Make chardet dependency mandatory), #82 (Fix proxy issue), #1973 (Dependency problem when using tox), and #67 (fix header encoding error).

[asvetlov]

Fixed by #3346

[lock]

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[new issue]: https://github.com/aio-libs/aiohttp/issues/new