[valadoc] doap: Update bug-database url

[Rico Tzschichholz <ricotz src gnome org>]

commit 8a745a3a96390c2e46b64eb7fe590bd759102513
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Sun Dec 16 21:47:45 2018 +0100

    doap: Update bug-database url

 valadoc.doap | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/valadoc.doap b/valadoc.doap
index 088c94b..27aa09e 100644
--- a/valadoc.doap
+++ b/valadoc.doap
@@ -12,7 +12,7 @@ from Vala source code based on libvala.</description>
 
   <homepage rdf:resource="https://wiki.gnome.org/Projects/Valadoc"; />
   <download-page rdf:resource="https://wiki.gnome.org/Projects/Valadoc"; />
-  <bug-database rdf:resource="https://bugzilla.gnome.org/browse.cgi?product=valadoc"; />
+  <bug-database rdf:resource="https://gitlab.gnome.org/GNOME/vala/issues"; />
 
   <category rdf:resource="http://api.gnome.org/doap-extensions#core"; />
   <programming-language>Vala</programming-language>