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* Marked AssertionLib as a typed package (`PEP 561 <https://www.python.org/dev/peps/pep-0561/>`_).
* Introduced updates and fixes to the type-annotations across the board.
* Exposed ``NDRepr``, ``aNDRepr`` and ``AbstractDataClass`` in the main ``__init__.py`` file.
* Added the ``__slots__`` attribute to ``AbstractDataClass``.
* Added the ``AssertionManager.any()`` and ``AssertionManager.all()`` methods.
* Added the ``post_process`` and ``message`` keywords to all
``AssertionManager`` assertion methods.