----------------
- ``grokcore.annotation.testing.warn`` was removed as it was not used
internally. If you still need it, a copy is in ``grokcore.view.testing``.
- Add ``_p_changed`` property to the LazyAnnotation object, proxying it to
the actual Storage object. That way the "API" for explicitely marking
objects as changed is the same regaredless of a "normal" annotation object
or an lazy annotation object.
- Add support for Python 3.7, 3.8 and 3.9.
- Drop support for Python 3.4.