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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.