implement chained exception tracebacks
patch from Antoine Pitrou #3112
diff --git a/Misc/NEWS b/Misc/NEWS
index e4178c0..a6ecc0e 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -22,6 +22,8 @@
- Issue #3236: Return small longs from PyLong_FromString.
+- Exception tracebacks now support exception chaining.
+
Library
-------
@@ -35,6 +37,8 @@
- All the u* variant functions and methods in gettext have been renamed to their
none u* siblings.
+- The traceback module has been expanded to handle chained exceptions.
+
C API
-----