[Checkins] [zopefoundation/zope.hookable] a91808: Add Python 3.8

[Marius Gedminas]

  Branch: refs/heads/py38
  Home:   https://github.com/zopefoundation/zope.hookable
  Commit: a918087e2ef86ac8ed3d91468f38c5021d9028c2
      https://github.com/zopefoundation/zope.hookable/commit/a918087e2ef86ac8ed3d91468f38c5021d9028c2
  Author: Marius Gedminas <marius at gedmin.as>
  Date:   2019-11-12 (Tue, 12 Nov 2019)

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

  Log Message:
  -----------
  Add Python 3.8