[Checkins] [zopefoundation/Products.ZCTextIndex] e1c1ae: Supported Python version cleanup

[Jens Vagelpohl]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/Products.ZCTextIndex
  Commit: e1c1ae4094eb0d955d20489e6afed7f857776cd2
      https://github.com/zopefoundation/Products.ZCTextIndex/commit/e1c1ae4094eb0d955d20489e6afed7f857776cd2
  Author: Jens Vagelpohl <jens at netz.ooo>
  Date:   2019-02-17 (Sun, 17 Feb 2019)

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

  Log Message:
  -----------
  Supported Python version cleanup

- specify supported Python versions using ``python_requires`` in setup.py
- added support for Python 3.7 and 3.8
- dropped support for Python 3.4 as Zope does not support it anymore