[Checkins] [zopefoundation/zope.schema] 31a387: Add Python 3.6, drop Python 3.3.

[GitHub]

  Branch: refs/heads/py36
  Home:   https://github.com/zopefoundation/zope.schema
  Commit: 31a3878946454b4f62d322ebf88187e6b44af460
      https://github.com/zopefoundation/zope.schema/commit/31a3878946454b4f62d322ebf88187e6b44af460
  Author: Jason Madden <jamadden at gmail.com>
  Date:   2017-07-10 (Mon, 10 Jul 2017)

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

  Log Message:
  -----------
  Add Python 3.6, drop Python 3.3.

Enable coverage reporting on Travis.

Run doctests on all versions on Travis.

Fixes #30