[Checkins] [zopefoundation/zope.security] 74fb64: Move version pinnings to config files.

[Michael Howitz]

  Branch: refs/heads/update
  Home:   https://github.com/zopefoundation/zope.security
  Commit: 74fb641d968dde64d17090d706abde206402f87a
      https://github.com/zopefoundation/zope.security/commit/74fb641d968dde64d17090d706abde206402f87a
  Author: Michael Howitz <mh at gocept.com>
  Date:   2019-04-04 (Thu, 04 Apr 2019)

  Changed paths:
    M .travis.yml
    M setup.py
    M tox.ini

  Log Message:
  -----------
  Move version pinnings to config files.

As suggested by @mgedmin