Z3c.preference

----------------

- Nothing changed yet.

----------------

- Drop support for Python 2.7, 3.5, 3.6.

- Add support for Python 3.8, 3.9, 3.10, 3.11.

----------------

- Update tests to `zope.testbrowser >= 5`.

- Add support for Python 3.6 and 3.7.

----------------

- Sorting preferences in ``CategoryEditForm`` by their `id` to stabialize
sort order.

----------------

- Descriptions of preference groups are now rendered in the ``group-header``
slot of the form above the error messages for the group.

- Fixed description of version `0.3`, it actually added descriptions for
preference categories, not preference groups.

----------------

- Descriptions of preference categories are now rendered in the
``extra-info`` slot of the form.