The date class is now properly subclassable.  (SF bug #720908)

(This is only the tip of the iceberg; the time and datetime classes
need the same treatment.)
diff --git a/Misc/NEWS b/Misc/NEWS
index 438e619..4f24edc 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -330,6 +330,8 @@
 
 - datetime changes:
 
+  The date class is now properly subclassable.  (SF bug #720908)
+
   The datetime and datetimetz classes have been collapsed into a single
   datetime class, and likewise the time and timetz classes into a single
   time class.  Previously, a datetimetz object with tzinfo=None acted