d/changelog: generate entry for 1.6.1-1

Generate entry using 'gbp dch'.

Git-Dch: Ignore
Signed-off-by: Arturo Borrero Gonzalez <arturo@debian.org>

debian/changelog

+iptables (1.6.1-1) unstable; urgency=medium
+
+  * Move from experimental to unstable
+  * [445bab4] d/control: maintainer is now the netfilter team
+
+ -- Arturo Borrero Gonzalez <arturo@debian.org>  Mon, 19 Jun 2017 11:56:28 +0200
+
 iptables (1.6.1-1~exp1) experimental; urgency=medium
 
   * [475b9a9] d/: add basic autopkgtests