add to release note

yl2526 · jreback · commit acc439064062 · 2017-07-01T11:39:08.000+03:00
diff --git a/doc/source/whatsnew/v0.21.0.txt b/doc/source/whatsnew/v0.21.0.txt
@@ -143,3 +143,5 @@ Categorical
 
 Other
 ^^^^^
+
+- Bug in ``.clip()`` now takes list or numpy-array; previously this raised ``ValueError`` (:issue:`15390`)

-Original file line number
+Diff line change
 Other
 ^^^^^
++
 +- Bug in ``.clip()`` now takes list or numpy-array; previously this raised ``ValueError`` (:issue:`15390`)