DOC: CHangelog

CHANGELOG.rst

@@ -2,6 +2,31 @@
 ======================
 
 
+0.21.0 (Thursday 8th May 2019)
+------------------------------
+
+
+Added
+^^^^^
+
+
+* :class:`.Column` objects now have a ``metadata`` attribute which may be used
+  in the column description (if the ``--description_file`` option is used).
+  Processing functions can set the metadata for newly added columns.
+* New ``metaproc`` plugin type to manipulate column metadata.
+* All processing functions accept a ``metaproc`` argument, allowing a
+  ``metaproc`` function to be applied to any column metadata that is returned
+  by the processing function..
+
+
+Changed
+^^^^^^^
+
+
+* The :func:`.binariseCategorical` function sets the categorical value as
+  column metadata on the new binarised columns.
+
+
 0.20.1 (Wednesday 8th May 2019)
 -------------------------------