SF patch #445412 extract ndiff functionality to difflib, from
David Goodger.
diff --git a/Misc/ACKS b/Misc/ACKS
index 604d2c4..cc007f7 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -144,6 +144,7 @@
 Thomas Gellekum
 Ben Gertzfield
 Jonathan Giddy
+David Goodger
 Hans de Graaff
 Duncan Grisby
 Dag Gruneau