update ChangeLog, add release message

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+2017-03-10  Moritz Bunkus  <moritz@bunkus.org>
+
+        * Released v1.4.6.
+
+        * KaxSemantic: add new elements dealing with 360°/VR content and
+        for language descriptors based on IETF BPC 47.
+
 2016-07-02  Moritz Bunkus  <moritz@bunkus.org>
 
         * Released v1.4.5.