[Checkins] [zopefoundation/zope.testrunner] 29b99c: Update major version because of dropping

[Michael Howitz]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/zope.testrunner
  Commit: 29b99cf66cf250912c5acd94c47f4011a62ac7e1
      https://github.com/zopefoundation/zope.testrunner/commit/29b99cf66cf250912c5acd94c47f4011a62ac7e1
  Author: Michael Howitz <mh at gocept.com>
  Date:   2019-03-19 (Tue, 19 Mar 2019)

  Changed paths:
    M CHANGES.rst

  Log Message:
  -----------
  Update major version because of dropping

support for 3.4.
[skip ci]