Add dummy changelog entry for 1.1.3.

debian/changelog

+tails (1.1.3) UNRELEASED; urgency=low
+
+  * Dummy changelog entry, replace me with actualy changes!
+
+ -- Tails developers <tails@boum.org>  Thu, 25 Sep 2014 16:07:45 +0200
+
 tails (1.1.2) unstable; urgency=medium
 
   * Security fixes