[Checkins] [zopefoundation/zope.sqlalchemy] 311926: Add Python 3.7 to Travis (#33)

[Andy Freeland]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/zope.sqlalchemy
  Commit: 311926084e2b1f615eac796e8a192f90653852c6
      https://github.com/zopefoundation/zope.sqlalchemy/commit/311926084e2b1f615eac796e8a192f90653852c6
  Author: Andy Freeland <andy at andyfreeland.net>
  Date:   2019-03-29 (Fri, 29 Mar 2019)

  Changed paths:
    M .travis.yml
    M CHANGES.rst
    M setup.py
    M tox.ini

  Log Message:
  -----------
  Add Python 3.7 to Travis (#33)

* Add Python 3.7 to Travis
* Explicitly include Postgres on Travis