Add news entries for #14731 and #12586.

Misc/NEWS

@@ -44,6 +44,14 @@ Core and Builtins
 Library
 -------
 
+- Issue #12586: Added new provisional policies that implement convenient
+  unicode support for email headers.  See What's New for details.
+
+- Issue #14731: Refactored email Policy framework to support full backward
+  compatibility with Python 3.2 by default yet allow for the introduction of
+  new features through new policies.  Note that Policy.must_be_7bit is renamed
+  to cte_type.
+
 - Issue #14920: Fix the help(urllib.parse) failure on locale C on terminals.
   Have ascii characters in help.