CLN: Add new line to whatsnew

Author: tyuyoshi

doc/source/whatsnew/v1.5.0.rst

@@ -268,6 +268,7 @@ Categorical
 - Bug in :meth:`Categorical.view` not accepting integer dtypes (:issue:`25464`)
 - Bug in :meth:`CategoricalIndex.union` when the index's categories are integer-dtype and the index contains ``NaN`` values incorrectly raising instead of casting to ``float64`` (:issue:`45362`)
 - Bug in :meth:`CategoricalIndex._concat` when concatenating categorical indexes that have the same categories returning indexes in improper order; this happening along with :meth:`concat` (:issue:`44099`)
+-
 
 Datetimelike
 ^^^^^^^^^^^^