Updated whatsnew

WillAyd · WillAyd · commit db0bd540d341 · 2018-02-15T18:03:25.000-08:00
diff --git a/doc/source/whatsnew/v0.23.0.txt b/doc/source/whatsnew/v0.23.0.txt
@@ -647,6 +647,7 @@ Performance Improvements
 - Improved performance of pairwise ``.rolling()`` and ``.expanding()`` with ``.cov()`` and ``.corr()`` operations (:issue:`17917`)
 - Improved performance of :func:`DataFrameGroupBy.rank` (:issue:`15779`)
 - Improved performance of variable ``.rolling()`` on ``.min()`` and ``.max()`` (:issue:`19521`)
+- Improved performance of :func:`GroupBy.any` (:issue:`15435`)
 
 .. _whatsnew_0230.docs:
 
