[Checkins] [zopefoundation/zope.hookable] c4c0a9: Add Python 3.6, drop Python 3.3

[GitHub]

  Branch: refs/heads/py36
  Home:   https://github.com/zopefoundation/zope.hookable
  Commit: c4c0a9245cf28b2d8939a1b933301c9e20b6f02a
      https://github.com/zopefoundation/zope.hookable/commit/c4c0a9245cf28b2d8939a1b933301c9e20b6f02a
  Author: Jason Madden <jamadden at gmail.com>
  Date:   2017-07-26 (Wed, 26 Jul 2017)

  Changed paths:
    A .coveragerc
    M .gitignore
    M .travis.yml
    M CHANGES.rst
    M MANIFEST.in
    M README.rst
    M docs/conf.py
    M setup.cfg
    M setup.py
    M src/zope/__init__.py
    M src/zope/hookable/__init__.py
    M src/zope/hookable/tests/test_hookable.py
    M tox.ini

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

- Run doctests on all versions of Python in tox and travis
- Enable coveralls and reach 100% coverage.
- Fix broken badge.
- Whitespace cleanup in setup.py
- Add python_requires