Setuptools

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Changes
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* 308: Allow version number normalization to be bypassed by wrapping in a 'setuptools.sic()' call.
* 1424: Prevent keeping files mode for package_data build. It may break a build if user's package data has read only flag.
* 1431: In ``easy_install.check_site_dir``, ensure the installation directory exists.
* 1563: In ``pkg_resources`` prefer ``find_spec`` (PEP 451) to ``find_module``.

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Breaking Changes
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* 65: Once again as in 3.0, removed the Features feature.

Changes
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* 1890: Fix vendored dependencies so importing ``setuptools.extern.some_module`` gives the same object as ``setuptools._vendor.some_module``. This makes Metadata picklable again.
* 1899: Test suite now fails on warnings.

Documentation changes
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* 2011: Fix broken link to distutils docs on package_data

Misc
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* 1991: Include pkg_resources test data in sdist, so tests can be executed from it.

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Changes
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* 1557: Deprecated eggsecutable scripts and updated docs.
* 1904: Update msvc.py to use CPython 3.8.0 mechanism to find msvc 14+

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Changes
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* 1905: Fixed defect in _imp, introduced in 41.6.0 when the 'tests' directory is not present.
* 1941: Improve editable installs with PEP 518 build isolation:

* The ``--user`` option is now always available. A warning is issued if the user site directory is not available.
* The error shown when the install directory is not in ``PYTHONPATH`` has been turned into a warning.
* 1981: Setuptools now declares its ``tests`` and ``docs`` dependencies in metadata (extras).
* 1985: Add support for installing scripts in environments where bdist_wininst is missing (i.e. Python 3.9).

Misc
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* 1968: Add flake8-2020 to check for misuse of sys.version or sys.version_info.

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Changes
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* 1458: Add minimum sunset date and preamble to Python 2 warning.
* 1704: Set sys.argv[0] in setup script run by build_meta.__legacy__
* 1974: Add Python 3 Only Trove Classifier and remove universal wheel declaration for more complete transition from Python 2.

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Breaking Changes
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* 1458: Drop support for Python 2. Setuptools now requires Python 3.5 or later. Install setuptools using pip >=9 or pin to Setuptools <45 to maintain 2.7 support.

Changes
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* 1959: Fix for Python 4: replace unsafe six.PY3 with six.PY2