Packaging cleanup

* Declare compliance with policy 4.7.2
* Update watch file to version 5
* Drop obsolete Rules-Requires-Root:

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: 4.7.0
+Standards-Version: 4.7.2
 Vcs-Browser: https://git.in-ulm.de/cbiedl/tang
 Vcs-Git: https://git.in-ulm.de/cbiedl/tang.git
 Build-Depends: debhelper-compat (= 13),
@@ -15,7 +15,6 @@ Build-Depends: debhelper-compat (= 13),
     meson,
     pkgconf,
 Priority: optional
-Rules-Requires-Root: no
 Section: net
 
 Package: tang

debian/watch

@@ -1,5 +1,4 @@
-
-version=4
-opts="searchmode=plain,filenamemangle=s/$/.tar.gz/" \
-https://api.github.com/repos/latchset/@PACKAGE@/releases \
-    https://github.com/latchset/@PACKAGE@/releases/download/[^/]+/@PACKAGE@-([0-9][.0-9]*)@ARCHIVE_EXT@
+Version: 5
+Template: Github
+Owner: latchset
+Project: @PACKAGE@