DOC: whatsnew entry for versioneer changes

docs/source/whatsnew/0.8.4.txt

@@ -49,6 +49,8 @@ Build
 ~~~~~
 
 * Makes zipline install requirements more flexible (:issue:`825`).
+* Use ``versioneer`` to manage the project ``__version__`` and setup.py version
+  (:issue:`829`).
 
 Documentation
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