Log Message:
py-setuptools: updated to 57.0.0

v57.0.0
-------
Breaking Changes
* License files excluded via the ``MANIFEST.in`` but matched by either
  the ``license_file`` (deprecated) or ``license_files`` options,
  will be nevertheless included in the source distribution. - by :user:`cdce8p`

Changes
* Write long description in message payload of PKG-INFO file. - by :user:`cdce8p`
* Added ``License-File`` (multiple) to the output package metadata.
  The field will contain the path of a license file, matched by the
  ``license_file`` (deprecated) and ``license_files`` options,
  relative to ``.dist-info``. - by :user:`cdce8p`
* Moved Setuptools' own entry points into declarative config.
* Vendored `more_itertools <https://pypi.org/project/more-itertools>`_ for \ 
Setuptools.
* Setuptools own setup.py no longer declares setup_requires, but instead expects \ 
wheel to be installed as declared by pyproject.toml.

Misc
* Updated the docs build tooling to support the latest version of
  Towncrier and show the previews of not-yet-released setuptools versions
  in the changelog -- :user:`webknjaz`

v56.2.0
-------
Changes
* Fixed handling of multiline license strings. - by :user:`cdce8p`
* Setuptools will now always try to use the latest supported
  metadata version for ``PKG-INFO``. - by :user:`cdce8p`

v56.1.0
-------
Changes
* Incorporated assorted changes from pypa/distutils.
* Adopted docs from distutils.
* Added Visual Studio Express 2017 support -- by :user:`dofuuz`

Misc
* Fixed ``DeprecationWarning`` due to ``threading.Thread.setDaemon`` in tests -- \ 
by :user:`tirkarthi`
* Made the changelog generator compatible
  with Towncrier >= 19.9 -- :user:`webknjaz`
* Relax the deprecation message in the distutils hack.