[Checkins] [zopefoundation/zope.sqlalchemy] 522aca: Add preliminary support for Python 3.9a3. (#42)

[Michael Howitz]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/zope.sqlalchemy
  Commit: 522aca3beeff8da03331b75dfe6d5bbf164c1739
      https://github.com/zopefoundation/zope.sqlalchemy/commit/522aca3beeff8da03331b75dfe6d5bbf164c1739
  Author: Michael Howitz <mh at gocept.com>
  Date:   2020-02-17 (Mon, 17 Feb 2020)

  Changed paths:
    M .travis.yml
    M CHANGES.rst
    R bootstrap.py
    M setup.py
    M src/zope/sqlalchemy/README.rst
    M tox.ini

  Log Message:
  -----------
  Add preliminary support for Python 3.9a3. (#42)

* Add preliminary support for Python 3.9a3.
* Fix deprecation warning.