[Checkins] [zopefoundation/z3c.flashmessage] aac17f: Use Python 3.8 final on Travis CI

[Marius Gedminas]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/z3c.flashmessage
  Commit: aac17f4912819335a427fe68681470429f67ada2
      https://github.com/zopefoundation/z3c.flashmessage/commit/aac17f4912819335a427fe68681470429f67ada2
  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