[Checkins] [zopefoundation/ZServer] 34f5f8: Update zc.buildout

[Jürgen Gmach]

  Branch: refs/heads/remove_Z_DEBUG_MODE
  Home:   https://github.com/zopefoundation/ZServer
  Commit: 34f5f8809be16efeaf344e47db5fb11cfb3c1a6e
      https://github.com/zopefoundation/ZServer/commit/34f5f8809be16efeaf344e47db5fb11cfb3c1a6e
  Author: Jürgen Gmach <juergen.gmach at apis.de>
  Date:   2019-02-03 (Sun, 03 Feb 2019)

  Changed paths:
    M .travis.yml

  Log Message:
  -----------
  Update zc.buildout

cf https://github.com/buildout/buildout/issues/460

modified:   .travis.yml