Added whatsnew for v0.23.5 (#22233)

Author: WillAyd

doc/source/whatsnew/v0.23.5.txt

@@ -0,0 +1,39 @@
+.. _whatsnew_0235:
+
+v0.23.5 (TBD 0, 2018)
+---------------------
+
+This is a minor bug-fix release in the 0.23.x series and includes some small regression fixes
+and bug fixes. We recommend that all users upgrade to this version.
+
+.. warning::
+
+   Starting January 1, 2019, pandas feature releases will support Python 3 only.
+   See :ref:`install.dropping-27` for more.
+
+.. contents:: What's new in v0.23.5
+    :local:
+    :backlinks: none
+
+.. _whatsnew_0235.fixed_regressions:
+
+Fixed Regressions
+~~~~~~~~~~~~~~~~~
+
+-
+-
+
+.. _whatsnew_0235.bug_fixes:
+
+Bug Fixes
+~~~~~~~~~
+
+**Groupby/Resample/Rolling**
+
+-
+-
+
+**Missing**
+
+-
+-