* Add support for Python 3.7, 3.8, 3.9, 3.10, 3.11.
* Drop support for Python 2.7, 3.4, 3.5, 3.6.
3.1.0
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* viewletmanager.viewlets should be a list so we can iterate over it several times in consumer code instead of having to remember it's an iterable we can only list once.
3.0.1
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* Rearrange tests such that Travis CI can pick up all functional tests too.
3.0.0
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* Python 3 compatibility.
1.11
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* Make the ``has_render()`` and ``has_no_render()`` symmetrical to those in grokcore.view, grokcore.layout and grokcore.formlib, where a ``render.base_method`` attribute is checked.