[Checkins] [zopefoundation/zope.exceptions] 1c21ff: Test on PyPy3 here, too.

[Michael Howitz]

  Branch: refs/heads/py39
  Home:   https://github.com/zopefoundation/zope.exceptions
  Commit: 1c21ffbb2788f1e263758add3514247a66e1b111
      https://github.com/zopefoundation/zope.exceptions/commit/1c21ffbb2788f1e263758add3514247a66e1b111
  Author: Michael Howitz <mh at gocept.com>
  Date:   2020-07-03 (Fri, 03 Jul 2020)

  Changed paths:
    M .travis.yml

  Log Message:
  -----------
  Test on PyPy3 here, too.