[Checkins] [zopefoundation/zope.tales] 460780: Fix test failures on Python 3.8.0a1 (#15)

[Marius Gedminas]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/zope.tales
  Commit: 460780200685ab56f030e0ff459a36be1dbbb72f
      https://github.com/zopefoundation/zope.tales/commit/460780200685ab56f030e0ff459a36be1dbbb72f
  Author: Marius Gedminas <marius at gedmin.as>
  Date:   2019-03-21 (Thu, 21 Mar 2019)

  Changed paths:
    M .travis.yml
    M CHANGES.rst
    M src/zope/tales/tales.py
    M tox.ini

  Log Message:
  -----------
  Fix test failures on Python 3.8.0a1 (#15)

* Avoid the deprecated cgi.escape

Fixes test failures on Python 3.8 prereleases (where cgi.escape is not
just deprecated, but gone entirely).