Z3c-relationfield

==================

Breaking changes:

- *add item here*

New features:

- *add item here*

Bug fixes:

- Test on Python 3.7 and 3.8 as well (next to 2.7, 3.5, 3.6). See `PR 19 <https://github.com/zopefoundation/z3c.relationfield/pull/19/>`_.

==================

New features:

- Provide IRelationBrokenEvent to be able to distinguish the event when
subscribing to IObjectModifiedEvent
[vangheem]

==================

New features:

- Adresses `Still uses BTrees wrongly, screws up people changing Interfaces <https://github.com/zopefoundation/z3c.relationfield/issues/4>`_, allows third party software to define which indexes are used.
[jensens]

Bug fixes:

- Fix DeprecationWarnings in ``tests.py``.
[jensens]

==================

- Python 3 compatibility: use the implementer decorator and fix ordering
[ale-rt]

- Python 3 compatibility: Make ``RelationValue`` hashable. [sallner]

- Renamed ``README.txt``to ``README.rst`` and ``CHANGES.txt`` to
``CHANGES.rst``.
[thet]

- Update buildout / travis config
[tomgross]

- Fix issue where relations are cleared on modify if they are not stored as
an class attribute. Usecase see https://github.com/plone/Products.CMFPlone/issues/2384
[tomgross]

================

- Remove dependencies on zope.app.*
[davisagli]

==================

* Remove dependency on grok.
[pbauer, jensens]