- Add new pyflakes codes
- Bump the required versions
- Fixes https://gitlab.com/pycqa/flake8/issues/422

Pass python_requires argument to setuptools

See merge request pycqa/flake8!225

Add hooks for new checks introduced in pycodestyle 2.4.0.
For details of the changes to pycodestyle, see:
https://pycodestyle.readthedocs.io/en/latest/developer.html

Add new pycodestyle check hooks for breaks around binary ops.

Remove broken hook to pycodestyle.break_around_binary_operator.

Helps pip decide what version of the library to install.

https://packaging.python.org/tutorials/distributing-packages/#python-requires

> If your project only runs on certain Python versions, setting the
> python_requires argument to the appropriate PEP 440 version specifier
> string will prevent pip from installing the project on other Python
> versions.

https://setuptools.readthedocs.io/en/latest/setuptools.html#new-and-changed-setup-keywords

> python_requires
>
> A string corresponding to a version specifier (as defined in PEP 440)
> for the Python version, used to specify the Requires-Python defined in
> PEP 345.