DOC: moving whatsnew entry to 0.20.0

Author: alexandercbooth

doc/source/whatsnew/v0.19.2.txt

@@ -80,6 +80,3 @@ Bug Fixes
 - Explicit check in ``to_stata`` and ``StataWriter`` for out-of-range values when writing doubles (:issue:`14618`)
 - Bug in ``.plot(kind='kde')`` which did not drop missing values to generate the KDE Plot, instead generating an empty plot. (:issue:`14821`)
 - Bug in ``unstack()`` if called with a list of column(s) as an argument, regardless of the dtypes of all columns, they get coerced to ``object`` (:issue:`11847`)
-
-- Bug in ``pd.scatter_matrix()`` could accept either ``color`` or ``c``, but
-  not both (:issue:`14855`)

doc/source/whatsnew/v0.20.0.txt

@@ -467,3 +467,6 @@ Bug Fixes
 
 
 - Bug in ``DataFrame.boxplot`` where ``fontsize`` was not applied to the tick labels on both axes (:issue:`15108`)
+
+- Bug in ``pd.scatter_matrix()`` could accept either ``color`` or ``c``, but
+  not both (:issue:`14855`)