[Checkins] [zopefoundation/Products.ZopeVersionControl] 21c9a4: Use Python 3.8 final on Travis CI

[Marius Gedminas]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/Products.ZopeVersionControl
  Commit: 21c9a4d7287b14876026c188133195440133f856
      https://github.com/zopefoundation/Products.ZopeVersionControl/commit/21c9a4d7287b14876026c188133195440133f856
  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