[Checkins] [zopefoundation/Products.PythonScripts] e258f2: Try without pinning the `six` version.

[GitHub]

  Branch: refs/heads/rp-4.0b4
  Home:   https://github.com/zopefoundation/Products.PythonScripts
  Commit: e258f284207b7ef9272b0b85cd6e968186e5aabb
      https://github.com/zopefoundation/Products.PythonScripts/commit/e258f284207b7ef9272b0b85cd6e968186e5aabb
  Author: Michael Howitz <mh at gocept.com>
  Date:   2018-08-17 (Fri, 17 Aug 2018)

  Changed paths:
    M .travis.yml

  Log Message:
  -----------
  Try without pinning the `six` version.



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