Declare compliance with policy 4.6.1

debian/control

@@ -1,7 +1,7 @@
 Source: tang
 Maintainer: Christoph Biedl <debian.axhn@manchmal.in-ulm.de>
 Homepage: https://github.com/latchset/tang
-Standards-Version: 4.5.1
+Standards-Version: 4.6.1
 Vcs-Browser: https://git.in-ulm.de/cbiedl/tang
 Vcs-Git: https://git.in-ulm.de/cbiedl/tang.git
 Build-Depends: debhelper-compat (= 13),