[Checkins] [zopefoundation/zope.exceptions] 25b69e: Add preliminary support for Python 3.9 (#16)

[Michael Howitz]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/zope.exceptions
  Commit: 25b69efd807cd3d9f7355ddd1fdc16bab933b63a
      https://github.com/zopefoundation/zope.exceptions/commit/25b69efd807cd3d9f7355ddd1fdc16bab933b63a
  Author: Michael Howitz <mh at gocept.com>
  Date:   2020-07-16 (Thu, 16 Jul 2020)

  Changed paths:
    M .travis.yml
    M CHANGES.rst
    M setup.cfg
    M setup.py
    M src/zope/exceptions/log.py
    M src/zope/exceptions/tests/test_exceptionformatter.py
    M tox.ini

  Log Message:
  -----------
  Add preliminary support for Python 3.9 (#16)

* Adapt tests to Python 3.9.
* Drop support for Python 3.5 as its sunset is in some months.