debian: update changelog

Signed-off-by: Nicolas Dechesne <nicolas.dechesne@linaro.org>

debian/changelog

+vidctest (0.1+20140718-1ubuntu2) trusty; urgency=medium
+
+  * debian: build for armhf only
+  * debian: set more options in gbp.conf
+  * debian: add README.Debian
+
+ -- Nicolas Dechesne <nicolas.dechesne@linaro.org>  Fri, 18 Jul 2014 14:20:40 +0000
+
 vidctest (0.1+20140718-1ubuntu1) trusty; urgency=medium
 
   * Initial debianization