Z3c.traverser

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- Nothing changed yet.

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- Drop support for Python 2.7, 3.3, 3.4.

- Add support for Python 3.7, 3.8, 3.9, 3.10, 3.11.

- Drop support to run the tests using ``python setup.py test``.

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- Standardize namespace __init__.

- Claim support for Python 3.4.

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- Added Trove classifiers to specify supported Python versions.

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- Added support for Python 3.3.

- Replaced deprecated ``zope.interface.implements`` usage with equivalent
``zope.interface.implementer`` decorator.

- Dropped support for Python 2.4 and 2.5.

- Switched from ``zope.testbrowser`` to ``WebTest`` for browser testing, since
testbrowser is not yet ported.

- Modernized API to use latest packages and component paths.

- Reduced test dependencies to the smallest set possible.

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- Updated test set up to run with ZTK 1.0.

- Using Python's ``doctest`` module instead of depreacted
``zope.testing.doctest[unit]``.