[Checkins] [zopefoundation/RestrictedPython] c39cff: Use Python 3.8 final on Travis CI

[Marius Gedminas]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/RestrictedPython
  Commit: c39cffe71dfc30630e946977735303d3a65b0383
      https://github.com/zopefoundation/RestrictedPython/commit/c39cffe71dfc30630e946977735303d3a65b0383
  Author: Marius Gedminas <marius at gedmin.as>
  Date:   2019-10-23 (Wed, 23 Oct 2019)

  Changed paths:
    M .travis.yml

  Log Message:
  -----------
  Use Python 3.8 final on Travis CI