----------------
- Only set response header Content-Type as text/html on exception views when
the response has content.
(`1089 <https://github.com/zopefoundation/Zope/issues/1089>`_)
- Drop support for Python 3.6, it has been in end-of-life status for a while.
- Update to newest compatible versions of dependencies.
- Fix history page for classes modifying instances in ``__setstate__``,
such as ``Products.PythonScripts.PythonScript`` instances.
See `launchpad issue 735999
<https://bugs.launchpad.net/zope2/+bug/735999>`_.