#1155362: allow hh:mm:ss-uuuu like we allow hh:mm:ss+uuuu in parsedate_tz

Original patch by Thomas Herve.
diff --git a/Misc/NEWS b/Misc/NEWS
index 9462981..faf5554 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -11,6 +11,9 @@
 Library
 -------
 
+- Issue #1155362: email.utils.parsedate_tz now handles a missing space before
+  the '-' of a timezone field as well as before a '+'.
+
 - Issue #4871: The zipfile module now gives a more useful error message if
   an attempt is made to use a string to specify the archive password.