[Checkins] [zopefoundation/zope.sendmail] 257b1f: Try latest PyPy versions

[Michael Howitz]

  Branch: refs/heads/icemac-patch-1
  Home:   https://github.com/zopefoundation/zope.sendmail
  Commit: 257b1fbd049ca1f1364efa5c32cf9bed3e6546bc
      https://github.com/zopefoundation/zope.sendmail/commit/257b1fbd049ca1f1364efa5c32cf9bed3e6546bc
  Author: Michael Howitz <mh at gocept.com>
  Date:   2020-07-17 (Fri, 17 Jul 2020)

  Changed paths:
    M .travis.yml

  Log Message:
  -----------
  Try latest PyPy versions

We use them in ZTK but pypy3 fails there relatively often.