Packaging

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* Add type hints (:issue:`191`)

* Add proper trove classifiers for PyPy support (:issue:`198`)

* Scale back depending on ``ctypes`` for manylinux support detection (:issue:`171`)

* Use ``sys.implementation.name`` where appropriate for ``packaging.tags`` (:issue:`193`)

* Expand upon the API provided by ``packaging.tags``: ``interpreter_name()``, ``mac_platforms()``, ``compatible_tags()``, ``cpython_tags()``, ``generic_tags()`` (:issue:`187`)

* Officially support Python 3.8 (:issue:`232`)

* Add ``major``, ``minor``, and ``micro`` aliases to ``packaging.version.Version`` (:issue:`225`)

* Properly mark ``packaging`` has being fully typed by adding a `py.typed` file (:issue:`226`)

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* Remove dependency on ``attrs`` (:issue:`178`, :issue:`179`)

* Use appropriate fallbacks for CPython ABI tag (:issue:`181`, :issue:`185`)

* Add manylinux2014 support (:issue:`186`)

* Improve ABI detection (:issue:`181`)

* Properly handle debug wheels for Python 3.8 (:issue:`172`)

* Improve detection of debug builds on Windows (:issue:`194`)

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* Add the ``packaging.tags`` module. (:issue:`156`)

* Correctly handle two-digit versions in ``python_version`` (:issue:`119`)

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* Fix string representation of PEP 508 direct URL requirements with markers.

* Better handling of file URLs

This allows for using ``file:///absolute/path``, which was previously
prevented due to the missing ``netloc``.

This allows for all file URLs that ``urlunparse`` turns back into the
original URL to be valid.

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* Improve error messages when invalid requirements are given. (:issue:`129`)

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* Fix ``utils.canonicalize_version`` when supplying non PEP 440 versions.