[Checkins] [zopefoundation/Persistence] ccd735: Use Python 3.8 final on Travis CI

[Marius Gedminas]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/Persistence
  Commit: ccd7357b5666c3c4d9136bbb932a9fb4fb93335a
      https://github.com/zopefoundation/Persistence/commit/ccd7357b5666c3c4d9136bbb932a9fb4fb93335a
  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