Update packaging to 21.0

[pyup-bot]

This PR updates packaging from 19.2 to 21.0.

Changelog

21.0

~~~~~~~~~~~~~~~~~

* `packaging` is now only compatible with Python 3.6 and above.
* Add support for zip files in ``parse_sdist_filename`` (:issue:`429`)

20.9

~~~~~~~~~~~~~~~~~

* Run `isort <https://pypi.org/project/isort/>`_ over the code base (:issue:`377`)
* Add support for the ``macosx_10_*_universal2`` platform tags (:issue:`379`)
* Introduce ``packaging.utils.parse_wheel_filename()`` and ``parse_sdist_filename()``
(:issue:`387` and :issue:`389`)

20.8

~~~~~~~~~~~~~~~~~

* Revert back to setuptools for compatibility purposes for some Linux distros (:issue:`363`)
* Do not insert an underscore in wheel tags when the interpreter version number
is more than 2 digits (:issue:`372`)

20.7

~~~~~~~~~~~~~~~~~

No unreleased changes.

20.6

~~~~~~~~~~~~~~~~~

.. note:: This release was subsequently yanked, and these changes were included in 20.7.

* Fix flit configuration, to include LICENSE files (:issue:`357`)
* Make `intel` a recognized CPU architecture for the `universal` macOS platform tag (:issue:`361`)
* Add some missing type hints to `packaging.requirements` (issue:`350`)

20.5

~~~~~~~~~~~~~~~~~

* Officially support Python 3.9 (:issue:`343`)
* Deprecate the ``LegacyVersion`` and ``LegacySpecifier`` classes (:issue:`321`)
* Handle ``OSError`` on non-dynamic executables when attempting to resolve
the glibc version string.

20.4

~~~~~~~~~~~~~~~~~

* Canonicalize version before comparing specifiers. (:issue:`282`)
* Change type hint for ``canonicalize_name`` to return
``packaging.utils.NormalizedName``.
This enables the use of static typing tools (like mypy) to detect mixing of
normalized and un-normalized names.

20.3

~~~~~~~~~~~~~~~~~

* Fix changelog for 20.2.

20.2

~~~~~~~~~~~~~~~~~

* Fix a bug that caused a 32-bit OS that runs on a 64-bit ARM CPU (e.g. ARM-v8,
aarch64), to report the wrong bitness.

20.1

~~~~~~~~~~~~~~~~~~~

* Fix a bug caused by reuse of an exhausted iterator. (:issue:`257`)

20.0

~~~~~~~~~~~~~~~~~

* 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:`226`)

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

Links

• PyPI: https://pypi.org/project/packaging
• Changelog: https://pyup.io/changelogs/packaging/
• Repo: https://github.com/pypa/packaging

[pyup-bot]

Closing this in favor of #296