PEP 759: Add Discussions-To header (#4038)

PEP 759 Discussions-To the DPO thread

Author: warsaw

peps/pep-0759.rst

@@ -3,6 +3,7 @@ Title: External Wheel Hosting
 Author: Barry Warsaw <barry@python.org>,
         Ethan Smith <ethan@ethanhs.me>
 PEP-Delegate: Donald Stufft <donald@python.org>
+Discussions-To: https://discuss.python.org/t/pep-759-external-wheel-hosting/66458
 Status: Draft
 Type: Standards Track
 Topic: Packaging