[Checkins] [zopefoundation/Products.ZCatalog] 456582: Use Python 3.8 final on Travis CI

[Marius Gedminas]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/Products.ZCatalog
  Commit: 456582e715eaeed2583cdead85bd8b80a1a3fafb
      https://github.com/zopefoundation/Products.ZCatalog/commit/456582e715eaeed2583cdead85bd8b80a1a3fafb
  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