Added note about the new usegmt argument to email.Utils.formatdate().

Misc/NEWS

@@ -50,6 +50,7 @@ Library
   Closes bug #1039270.
 
 - Updates for the email package:
+  + email.Utils.formatdate() grew a 'usegmt' argument for HTTP support.
   + All deprecated APIs that in email 2.x issued warnings have been removed:
     _encoder argument to the MIMEText constructor, Message.add_payload(),
     Utils.dump_address_pair(), Utils.decode(), Utils.encode()