py3: decode email headers with mail.headdecode() in notify extension stable

py3: decode email headers with mail.headdecode() in notify extension

--- a/hgext/notify.py	Thu Oct 24 15:46:16 2019 +0200
+++ b/hgext/notify.py	Thu Oct 24 15:50:15 2019 +0200
@@ -391,9 +391,9 @@
         sender = msg[r'From']
         subject = msg[r'Subject']
         if sender is not None:
-            sender = encoding.strtolocal(sender)
+            sender = mail.headdecode(sender)
         if subject is not None:
-            subject = encoding.strtolocal(subject)
+            subject = mail.headdecode(subject)
         del msg[r'From'], msg[r'Subject']
 
         if not msg.is_multipart():