[Checkins] [zopefoundation/z3c.ptcompat] b3a8ee: Add Python 3.6, drop Python 3.3

[GitHub]

  Branch: refs/heads/issue3
  Home:   https://github.com/zopefoundation/z3c.ptcompat
  Commit: b3a8ee28bd5c421952509e3d0e26bfb1c7bba97b
      https://github.com/zopefoundation/z3c.ptcompat/commit/b3a8ee28bd5c421952509e3d0e26bfb1c7bba97b
  Author: Jason Madden <jamadden at gmail.com>
  Date:   2017-10-16 (Mon, 16 Oct 2017)

  Changed paths:
    A .coveragerc
    M .gitignore
    M .travis.yml
    A CHANGES.rst
    R CHANGES.txt
    A README.rst
    R README.txt
    A setup.cfg
    M setup.py
    M src/z3c/__init__.py
    M src/z3c/ptcompat/engine.py
    M src/z3c/ptcompat/tests.py
    M tox.ini

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

Fixes #3.

Project gardening:

- Add coverage environment and coveralls.
  - Reach 100% coverage.
- Rename .txt -> .rst
- Add badges to README.rst