[Checkins] [zopefoundation/Products.PythonScripts] 31e98d: Clean up Python version support

[Jens Vagelpohl]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/Products.PythonScripts
  Commit: 31e98ddc379fb0b6b504a6196de36f8888eae4f1
      https://github.com/zopefoundation/Products.PythonScripts/commit/31e98ddc379fb0b6b504a6196de36f8888eae4f1
  Author: Jens Vagelpohl <jens at netz.ooo>
  Date:   2019-02-17 (Sun, 17 Feb 2019)

  Changed paths:
    M .travis.yml
    M CHANGES.rst
    M setup.py
    M tox.ini

  Log Message:
  -----------
  Clean up Python version support

- specify supported Python versions using ``python_requires`` in setup.py
- added support for Python 3.8