Add a ChangeLog

CHANGELOG.rst

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+=========================
+xapian-haystack Changelog
+=========================
+
+v3.0.0 (2021-10-26)
+-------------------
+
+- Dropped Python 2 support.
+- Supported Django versions: 2.2, 3.0, 3.1, 3.2
+- Dropped support for xapian < 1.4
+- Added new ``xapian_wheel_builder.sh`` script.
+- Fixed ``os.path.exists`` race situation.
+- Fixed setup.py on non-UTF-8 systems.
+
+v2.1.1 (2017-05-18)
+-------------------
+
+- Django 1.8 as minimal version, added support for Django 1.9/1.10.
+- Adapted default Haystack query from ``contains`` to ``content``.
+- Raise ``NotImplementedError`` for endswith queries.
+- Supported range search filter (#161).
+- Configure ``limit_to_registered_models`` according to haystack docs.