[Checkins] [zopefoundation/Zope] c9871f: Add currently supported maximum Python version.

[Michael Howitz]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/Zope
  Commit: c9871f5fc2cefacf1839e09934eb0c5fadc9a2da
      https://github.com/zopefoundation/Zope/commit/c9871f5fc2cefacf1839e09934eb0c5fadc9a2da
  Author: Michael Howitz <mh at gocept.com>
  Date:   2019-08-15 (Thu, 15 Aug 2019)

  Changed paths:
    M docs/zope4/news.rst

  Log Message:
  -----------
  Add currently supported maximum Python version.

I don't think there will be support for Python 3.9+ in Zope 4.
This will be done in Zope 5+.