[Checkins] [zopefoundation/Products.ZSQLMethods] 78ca6f: Supported Python version cleanup

[Jens Vagelpohl]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/Products.ZSQLMethods
  Commit: 78ca6ff419c55b28280d6f908358d485f94692ef
      https://github.com/zopefoundation/Products.ZSQLMethods/commit/78ca6ff419c55b28280d6f908358d485f94692ef
  Author: Jens Vagelpohl <jens at netz.ooo>
  Date:   2019-02-17 (Sun, 17 Feb 2019)

  Changed paths:
    M .travis.yml
    M CHANGES.rst
    M setup.py
    M src/Shared/DC/ZRDB/Connection.py
    M src/Shared/DC/ZRDB/Search.py
    M tox.ini

  Log Message:
  -----------
  Supported Python version cleanup

- specify supported Python versions using ``python_requires`` in setup.py
- added support for Python 3.7 and 3.8