added pull request number in whitens

Author: necnec

doc/source/whatsnew/v0.20.0.txt

@@ -50,7 +50,8 @@ Other enhancements
 - ``Series.sort_index`` accepts parameters ``kind`` and ``na_position`` (:issue:`13589`, :issue:`14444`)
 
 - ``pd.read_excel`` now preserves sheet order when using ``sheetname=None`` (:issue:`9930`)
-- ``pd.io.gbq.read_gbq`` method now allows query configuration preferences
+
+- ``pd.io.gbq.read_gbq`` method now allows query configuration preferences (:issue:`14742`)
 
 - New ``UnsortedIndexError`` (subclass of ``KeyError``) raised when indexing/slicing into an
   unsorted MultiIndex (:issue:`11897`). This allows differentiation between errors due to lack