Add entry to whatsnew file

Marco Gorelli · Marco Gorelli · commit 072544076ace · 2019-08-23T15:43:32.000+01:00
diff --git a/doc/source/whatsnew/v1.0.0.rst b/doc/source/whatsnew/v1.0.0.rst
@@ -174,7 +174,7 @@ Groupby/resample/rolling
 ^^^^^^^^^^^^^^^^^^^^^^^^
 
 -
--
+- Bug in :meth:`pandas.core.groupby.SeriesGroupBy.nunique` where ``NaT`` values were interfering with the count of unique values (:issue:`27951`)
 - Bug in :meth:`DataFrame.groupby` not offering selection by column name when ``axis=1`` (:issue:`27614`)
 
 Reshaping

Original file line number	Diff line number	Diff line change
`@@ -174,7 +174,7 @@ Groupby/resample/rolling`
`174`	`174`	`^^^^^^^^^^^^^^^^^^^^^^^^`
`175`	`175`
`176`	`176`	`-`
`177`		`--`
	`177`	+- Bug in :meth:`pandas.core.groupby.SeriesGroupBy.nunique` where ``NaT`` values were interfering with the count of unique values (:issue:`27951`)
`178`	`178`	- Bug in :meth:`DataFrame.groupby` not offering selection by column name when ``axis=1`` (:issue:`27614`)
`179`	`179`
`180`	`180`	`Reshaping`