Add whatnew note

thy09 · Heyi Tang · commit 7db70f8a83af · 2019-11-28T13:23:09.000+08:00
diff --git a/doc/source/whatsnew/v1.0.0.rst b/doc/source/whatsnew/v1.0.0.rst
@@ -674,6 +674,7 @@ Other
 - Bug in :meth:`DataFrame.append` that raised ``IndexError`` when appending with empty list (:issue:`28769`)
 - Fix :class:`AbstractHolidayCalendar` to return correct results for
   years after 2030 (now goes up to 2200) (:issue:`27790`)
+- Bug in :meth:`Series.count` raises if use_inf_as_na is enabled (:issue:`29478`)
 
 
 .. _whatsnew_1000.contributors:
