debian/changelog

+josm (0.0.svn15155+dfsg-1) unstable; urgency=medium
+
+  * Move from experimental to unstable.
+  * Update gbp.conf to use --source-only-changes by default.
+
+ -- Bas Couwenberg <sebastic@debian.org>  Sun, 07 Jul 2019 07:13:38 +0200
+
 josm (0.0.svn15155+dfsg-1~exp1) experimental; urgency=medium
 
   * New hotfix tested snapshot.

debian/gbp.conf

@@ -14,3 +14,6 @@ upstream-tag = upstream/%(version)s
 
 # Always use pristine-tar.
 pristine-tar = True
+
+[buildpackage]
+pbuilder-options = --source-only-changes