Packaging2

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

* Revert back to setuptools for compatibility purposes for some Linux distros (`363 <https://github.com/pypa/packaging/issues/363>`__)
* Do not insert an underscore in wheel tags when the interpreter version number
is more than 2 digits (`372 <https://github.com/pypa/packaging/issues/372>`__)

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No unreleased changes.

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

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

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* Officially support Python 3.9 (`343 <https://github.com/pypa/packaging/issues/343>`__)
* Deprecate the ``LegacyVersion`` and ``LegacySpecifier`` classes (`321 <https://github.com/pypa/packaging/issues/321>`__)
* Handle ``OSError`` on non-dynamic executables when attempting to resolve
the glibc version string.

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

* Canonicalize version before comparing specifiers. (`282 <https://github.com/pypa/packaging/issues/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.

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

* Fix changelog for 20.2.