d/changelog: generate entry for 1.6.0-2 unstable

Rebuild for unstable.

Git-Dch: Ignore
Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>

debian/changelog

+iptables (1.6.0-2) unstable; urgency=medium
+
+  * Rebuild for unstable
+
+ -- Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>  Wed, 27 Jan 2016 19:07:11 +0100
+
 iptables (1.6.0-1) experimental; urgency=medium
 
   * [615f9fc] Imported Upstream version 1.6.0