==================
- When registering views, no longer pass the deprecated 'layer' agrument
to ``zope.component.registerAdapter``. Instead, pass ``(for_, layer)``
as expected (forward-compatibility with ``zope.component`` 4.0.0).
- Replace deprecated ``zope.interface.implements`` usage with equivalent
``zope.interface.implementer`` decorator.
- Drop support for Python 2.4 and 2.5.