[gnome-calendar] appdata: Update bugtracker URL

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit cc45db23544245d295697a6c7c005c1b32785671
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Tue Jan 30 02:01:33 2018 -0200

    appdata: Update bugtracker URL

 data/appdata/org.gnome.Calendar.appdata.xml.in | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/data/appdata/org.gnome.Calendar.appdata.xml.in b/data/appdata/org.gnome.Calendar.appdata.xml.in
index f703cfde..60fcb95e 100644
--- a/data/appdata/org.gnome.Calendar.appdata.xml.in
+++ b/data/appdata/org.gnome.Calendar.appdata.xml.in
@@ -45,7 +45,7 @@
   </kudos>
 
   <url type="homepage">https://wiki.gnome.org/Apps/Calendar</url>
-  <url type="bugtracker">https://bugzilla.gnome.org/enter_bug.cgi?product=gnome-calendar</url>
+  <url type="bugtracker">https://gitlab.gnome.org/GNOME/gnome-calendar/issues</url>
   <project_group>GNOME</project_group>
 
   <releases>