#1162477: accept '.' in addition to ':' when parsing time in date header.

Some non-compliant MUAs use '.'s, so by the Postel Principle we should
accept them.  Patch by Thomas Herve.
diff --git a/Misc/NEWS b/Misc/NEWS
index f22f41c..a87e501 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -68,6 +68,9 @@
 Library
 -------
 
+- Issue #1162477: Postel Principal adjustment to email date parsing: handle the
+  fact that some non-compliant MUAs use '.' instead of ':' in time specs.
+
 - Issue #11131: Fix sign of zero in decimal.Decimal plus and minus
   operations when the rounding mode is ROUND_FLOOR.