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Features:
* Add `ma.TableSchema` (:pr:`124`).
* SQLAlchemy requirements can be installed with ``pip install
'flask-marshmallow[sqlalchemy]'``.
Bug fixes:
* ``URLFor``, ``AbsoluteURLFor``, and ``HyperlinkRelated`` serialize to ``None`` if a passed attribute value is ``None`` (:issue:`18`, :issue:`68`, :pr:`72`).
Thanks :user:`RobinRamuel`, :user:`ocervell`, and :user:`feigner` for reporting.
Support:
* Test against Python 3.7.
* Drop support for Python 3.4. Only Python 2.7 and >=3.5 are supported.