Added clear cache methods to clear the internal type lookup cache for ref leak test runs.
diff --git a/Misc/NEWS b/Misc/NEWS
index 78eb6a3..136494c 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,9 @@
Core and builtins
-----------------
+- Added ``PyType_ClearCache()`` and ``sys._cleartypecache`` to clear the
+ internal lookup cache for ref leak tests.
+
- Patch #1473257: generator objects gain a gi_code attribute. This is the
same object as the func_code attribute of the function that produced the
generator.