[Checkins] [zopefoundation/z3c.batching] 021f18: Modernize Python versions

[Jürgen Gmach]

  Branch: refs/heads/mod-python
  Home:   https://github.com/zopefoundation/z3c.batching
  Commit: 021f1867d82ef79053a90584896573fc5d0f06b0
      https://github.com/zopefoundation/z3c.batching/commit/021f1867d82ef79053a90584896573fc5d0f06b0
  Author: Jürgen Gmach <juergen.gmach at googlemail.com>
  Date:   2020-05-14 (Thu, 14 May 2020)

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

  Log Message:
  -----------
  Modernize Python versions

- Add support for Python 3.8.

- Drop support for Python 3.4.

modified:   .travis.yml
modified:   CHANGES.txt
modified:   setup.py
modified:   tox.ini