update to v0.5

git-svn-id: https://redmine.imt-atlantique.fr/svn/xaal/code/Python/trunk@1370 b32b6428-25c9-4566-ad07-03861ab6144f

xaal-lib/CHANGELOG.rst

 Changelog
 =========
 
+v0.5:
+    * Add security layer. See specification for more details
+
 v0.4_r3:
     * Add hwId and childrens attributes.
     * EmbeddedMixin in devices is no more needed and has been removed.