MAINT: Add missing components to PR

Author: gfyoung

doc/source/timeseries.rst

@@ -1092,7 +1092,7 @@ frequencies. We will refer to these aliases as *offset aliases*
     "BQ", "business quarter endfrequency"
     "QS", "quarter start frequency"
     "BQS", "business quarter start frequency"
-    "A", "year end frequency"
+    "A, Y", "year end frequency"
     "BA", "business year end frequency"
     "AS", "year start frequency"
     "BAS", "business year start frequency"

doc/source/whatsnew/v0.21.0.txt

@@ -40,6 +40,7 @@ Other Enhancements
 - :func:`DataFrame.clip()` and :func:`Series.clip()` have gained an ``inplace`` argument. (:issue:`15388`)
 - :func:`crosstab` has gained a ``margins_name`` parameter to define the name of the row / column that will contain the totals when ``margins=True``. (:issue:`15972`)
 - :func:`DataFrame.select_dtypes` now accepts scalar values for include/exclude as well as list-like. (:issue:`16855`)
+- :func:`date_range` now accepts 'Y' in addition to 'A' as an alias for end of year (:issue:`9313`)
 
 .. _whatsnew_0210.api_breaking: