* Drop support for ``pkg_resources`` namespace and replace it with PEP 420 native namespace. Caution: This change requires to switch all packages in the `five` namespace to versions using a PEP 420 namespace.
* Drop support for Python 3.7, 3.8.
* Add support for Python 3.12, 3.13.
4.0
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* Drop support for Python 2.7, 3.5, 3.6.
3.4
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* Fix insidious buildout configuration bug for tests against Zope 4.