Packaging cleanup

* Declare compliance with policy 4.6.0
* Bump debhelper compat level to 13
* Update watch file

debian/control

@@ -1,17 +1,17 @@
 Source: bgpdump
 Maintainer: Christoph Biedl <debian.axhn@manchmal.in-ulm.de>
 Homepage: https://github.com/RIPE-NCC/bgpdump
-Standards-Version: 4.4.1
+Standards-Version: 4.6.0
 Vcs-Browser: https://git.in-ulm.de/cbiedl/bgpdump
 Vcs-Git: https://git.in-ulm.de/cbiedl/bgpdump.git
-Build-Depends: debhelper-compat (= 12),
+Build-Depends: debhelper-compat (= 13),
     asciidoctor,
     libbsd-dev,
     libbz2-dev,
     zlib1g-dev,
 Priority: optional
-Section: admin
 Rules-Requires-Root: no
+Section: admin
 
 Package: bgpdump
 Architecture: any

debian/watch

@@ -1,4 +1,4 @@
 version=4
 https://github.com/RIPE-NCC/bgpdump/releases \
-    /RIPE-NCC/bgpdump/archive/v([0-9.]+)\.tar\.gz \
+    /RIPE-NCC/bgpdump/releases/download/v([0-9.]+)/libbgpdump-[0-9.]+\.tgz \
     debian uupdate