Update homepage information and watch file

debian/control

@@ -1,6 +1,6 @@
 Source: bgpdump
 Maintainer: Christoph Biedl <debian.axhn@manchmal.in-ulm.de>
-Homepage: https://bitbucket.org/ripencc/bgpdump/wiki/Home
+Homepage: https://github.com/RIPE-NCC/bgpdump
 Standards-Version: 4.4.1
 Vcs-Browser: https://git.in-ulm.de/cbiedl/bgpdump
 Vcs-Git: https://git.in-ulm.de/cbiedl/bgpdump.git

debian/watch

@@ -1,4 +1,4 @@
 version=4
-https://bitbucket.org/ripencc/bgpdump/downloads?tab=tags \
-    /ripencc/bgpdump/get/([0-9.]+)\.tar\.bz2 \
+https://github.com/RIPE-NCC/bgpdump/releases \
+    /RIPE-NCC/bgpdump/archive/v([0-9.]+)\.tar\.gz \
     debian uupdate