Update NEWS for 3.6.4 final

diff --git a/Misc/NEWS.d/3.6.4.rst b/Misc/NEWS.d/3.6.4.rst
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+.. bpo: 0
+.. date: 2017-12-18
+.. no changes: True
+.. nonce: qH8KPG
+.. release date: 2017-12-18
+.. section: Library
+
+There were no new code changes in version 3.6.4 since v3.6.4rc1.