Issue #26804: urllib.request will prefer lower_case proxy environment variables
over UPPER_CASE or Mixed_Case ones.

Patch contributed by Hans-Peter Jansen. Reviewed by Martin Panter and Senthil Kumaran.
diff --git a/Misc/ACKS b/Misc/ACKS
index 6f4bfdb..2d920db 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -670,6 +670,7 @@
 Bertrand Janin
 Geert Jansen
 Jack Jansen
+Hans-Peter Jansen
 Bill Janssen
 Thomas Jarosch
 Juhana Jauhiainen