while mucking around, set feed to atom to match type I set in autodiscovery link [#26402939]

core/feeds.py

@@ -1,8 +1,10 @@
 from django.contrib.auth.models import User
 from django.contrib.syndication.views import Feed
 from django.shortcuts import get_object_or_404
+from django.utils.feedgenerator import Atom1Feed
 
 class SupporterWishlistFeed(Feed):
+    feed_type = Atom1Feed
     def get_object(self, request, supporter):
         return get_object_or_404(User, username=supporter)