bpo-26707: Enable plistlib to read UID keys. (GH-12153)

Plistlib currently throws an exception when asked to decode a valid
.plist file that was generated by Apple's NSKeyedArchiver. Specifically,
this is caused by a byte 0x80 (signifying a UID) not being understood.

This fixes the problem by enabling the binary plist reader and writer
to read and write plistlib.UID objects.
diff --git a/Misc/ACKS b/Misc/ACKS
index ec5b017..f5a31a8 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -754,6 +754,7 @@
 Jack Jansen
 Hans-Peter Jansen
 Bill Janssen
+Jon Janzen
 Thomas Jarosch
 Juhana Jauhiainen
 Rajagopalasarma Jayakrishnan