Bump version to 1.18.19

debian/changelog

@@ -1,3 +1,9 @@
+dpkg (1.18.19) UNRELEASED; urgency=medium
+
+  *
+
+ -- Guillem Jover <guillem@debian.org>  Tue, 20 Dec 2016 14:30:31 +0100
+
 dpkg (1.18.18) unstable; urgency=medium
 
   [ Guillem Jover ]