----------------
- Open primary database using ``request.tm``, if present, as the transaction
manager. If not present, fall back to the default / global transaction
manager. Compatibility with ``pyramid_tm >= 0.11``, which allowed the
user to specify an explicit per-request transaction factory.
https://github.com/Pylons/pyramid_zodbconn/issues/6.
- Add support for Python 3.5 and 3.6.
- Drop support for Python 2.6, 3.2, and 3.3.