Flake8-comprehensions

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* Drop Python 2 support, only Python 3.4+ is supported now.

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* Fix false positives in ``C408`` for calls using ``*args`` or ``**kwargs``.

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* Plugin now reserves the full ``C4XX`` code space rather than just ``C40X``
* ``C408`` rule that complains about using ``tuple()``, ``list()``, or
``dict()`` instead of a literal.
* ``C409`` and ``C410`` rules that complain about an unnecessary list or tuple
that could be rewritten as a literal.
* ``C411`` rule that complains about using list comprehension inside a
``list()`` call.

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* Don't allow installation with Flake8 3.2.0 which doesn't enable the plugin.
This bug was fixed in Flake8 3.2.1.
* Prevent false positives of ``C402`` from generators of expressions that
aren't two-tuples.
* ``C405`` and ``C406`` now also complain about unnecessary tuple literals.

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* ``C407`` rule that complains about unnecessary list comprehensions inside
builtins that can work on generators.

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* Split all rule codes by type. This allows granular selection of the rules in
flake8 configuration.