[Checkins] [zopefoundation/zExceptions] cfc300: Do not cache eggs

[Michael Howitz]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/zExceptions
  Commit: cfc300cc6067b567a03f948875a1f667e95129b8
      https://github.com/zopefoundation/zExceptions/commit/cfc300cc6067b567a03f948875a1f667e95129b8
  Author: Michael Howitz <mh at gocept.com>
  Date:   2019-05-06 (Mon, 06 May 2019)

  Changed paths:
    M .travis.yml

  Log Message:
  -----------
  Do not cache eggs

We do not use `zc.buildout` here.