[Checkins] [zopefoundation/zope.principalannotation] 3450cb: Fix tests and add Python 3.7

[GitHub]

  Branch: refs/heads/issue6
  Home:   https://github.com/zopefoundation/zope.principalannotation
  Commit: 3450cb0e133658ae3448499f4ed7296345277a23
      https://github.com/zopefoundation/zope.principalannotation/commit/3450cb0e133658ae3448499f4ed7296345277a23
  Author: Jason Madden <jamadden at gmail.com>
  Date:   2018-10-19 (Fri, 19 Oct 2018)

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

  Log Message:
  -----------
  Fix tests and add Python 3.7

Fixes #6 and fixes #7



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