Update changelog

Author: python-desert

CHANGELOG.rst

@@ -1,3 +1,23 @@
+2020.01.03 (2020-01-04)
+-----------------------
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+Changes
+^^^^^^^
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+- Add support for Tuple[int, ...] per https://docs.python.org/3/library/typing.html#typing.Tuple
+  `#16 <https://github.com/python-desert/desert/issues/16>`_ Thanks to @sveinse for reporting and testing.
+- Use module imports internally.
+  `#18 <https://github.com/python-desert/desert/issues/18>`_
+- Desert version only needs to be updated in _version.py
+  `#19 <https://github.com/python-desert/desert/issues/19>`_
+- Fix doctests.
+  `#20 <https://github.com/python-desert/desert/issues/20>`_
+
+
+----
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+
 2020.01.03
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