[Checkins] [zopefoundation/zodbpickle] 08f1a3: Fix Python 3.5 MacOS wheel upload

[Marius Gedminas]

  Branch: refs/heads/fix-macos-3.5-wheel-upload
  Home:   https://github.com/zopefoundation/zodbpickle
  Commit: 08f1a39b44ef3e151cffe81c6d90da9952832982
      https://github.com/zopefoundation/zodbpickle/commit/08f1a39b44ef3e151cffe81c6d90da9952832982
  Author: Marius Gedminas <marius at gedmin.as>
  Date:   2019-11-12 (Tue, 12 Nov 2019)

  Changed paths:
    M .travis.yml

  Log Message:
  -----------
  Fix Python 3.5 MacOS wheel upload

Python 3.5 on Mac OS doesn't support TLS 1.2, which makes twine upload
fail, but we can use system Python 2.7 for twine upload, which works.

Also brings the rest of the Travis CI configuration closer in line to
the rest of the packages updated for
https://github.com/zopefoundation/meta/issues/11