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- Drop support for Zope 2, require Zope >= 4.0b6 now.
- Add support for Python 3.5, 3.6 and 3.7.
- Drop `ZServer` dependency.
- Add ``IPubFailure`` event handler so it writes error log entries again.
- Bring back Application initialization (creation of `SiteErrorLog` in the
ZODB on first startup).
- Style forms for Bootstrap ZMI.
(`12 <https://github.com/zopefoundation/Products.SiteErrorLog/pull/12>`_)