Fix SF bug #689659, 64-bit int and long hash keys incompatible

On a 64-bit machine, a dictionary could contain duplicate int/long keys
if the value was > 2**32.
diff --git a/Misc/NEWS b/Misc/NEWS
index 8d5a669..c123689 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,7 +12,8 @@
 Core and builtins
 -----------------
 
-TBD
+- On 64-bit systems, a dictionary could contain duplicate long/int keys
+  if the key value was larger than 2**32.  See SF bug #689659.
 
 Extension modules
 -----------------