Pep8-naming

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* Fix potential stack exhaustion in the N818 check.

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* flake8 3.9.1 or later is now required.

* N818 checks exception class names for an "Error" suffix (disabled by default).

* ``asyncSetUp`` and ``asyncTearDown`` are now exempted by default.

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* Fix an AST-related AttributeError when processing decorator lists.

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* ``__class_getitem__`` is now recognized as a class method.

* Support ``ast.Call`` nodes in decorator lists (``decorator(arg)``).

* As a performance improvement, only checks for selected error codes are run.

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* ``--ignore-names`` now supports globbing and applies to the N804 and N805
checks.

* "acronym" imports are now treated as their own error code (N817).

* Metaclass detection has been improved.

* Annotated variable declarations (PEP 526) and ``:=`` variable assignments
are now supported.

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* Fix line number offsets when reporting errors involving functions with
decorators in Python 3.8 and later.