bpo-15450: Allow subclassing of dircmp (GH-23424) (#23424)

Co-authored-by: Chris Jerdonek <chris.jerdonek@gmail.com>
diff --git a/Misc/ACKS b/Misc/ACKS
index 43030ca..16bc42f 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -368,6 +368,7 @@
 Christopher A. Craig
 Jeremy Craven
 Laura Creighton
+Nick Crews
 Tyler Crompton
 Simon Cross
 Felipe Cruz