Prepare release

debian/changelog

-dns-flood-detector (1.20-5) UNRELEASED; urgency=medium
+dns-flood-detector (1.20-5) unstable; urgency=medium
 
-  * UNRELEASED
+  * [d1ee939] travis-ci: Use xenial image
+  * [187c4cb] d/control: Bump Standards-Version to 4.3.0, no changes needed
+  * [0f96e5a] d/rules: don't touch opmimisations cflags directly
 
- -- Jan Wagner <waja@cyconet.org>  Mon, 05 Dec 2016 14:28:22 +0100
+ -- Jan Wagner <waja@cyconet.org>  Thu, 24 Jan 2019 10:45:28 +0100
 
 dns-flood-detector (1.20-4) unstable; urgency=medium