[Checkins] [zopefoundation/z3c.etestbrowser] 6c9fa7: Drop the `zope.app.testing` extra.

[Michael Howitz]

  Branch: refs/heads/update-testbrowser-api
  Home:   https://github.com/zopefoundation/z3c.etestbrowser
  Commit: 6c9fa7537e743c09798b7c71a415c3768e6adcc7
      https://github.com/zopefoundation/z3c.etestbrowser/commit/6c9fa7537e743c09798b7c71a415c3768e6adcc7
  Author: Michael Howitz <mh at gocept.com>
  Date:   2019-02-27 (Wed, 27 Feb 2019)

  Changed paths:
    M CHANGES.txt
    M setup.py

  Log Message:
  -----------
  Drop the `zope.app.testing` extra.

It dropped its special ``zope.testbrowser`` support and we do not need it for
our tests or code any more.