[gtkmm-documentation] configure.ac: Update bug report address

[Kjell Ahlstedt <kjellahl src gnome org>]

commit c41435b272426fd65b1f9be7b2c2fbd36d484aab
Author: Kjell Ahlstedt <kjellahlstedt gmail com>
Date:   Fri Oct 26 16:34:09 2018 +0200

    configure.ac: Update bug report address

 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/configure.ac b/configure.ac
index 9aa75f4..333e0c4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2,7 +2,7 @@
 
 AC_PREREQ([2.59])
 AC_INIT([gtkmm-documentation], [3.89.0],
-        [http://bugzilla.gnome.org/enter_bug.cgi?product=gtkmm],
+        [https://gitlab.gnome.org/GNOME/gtkmm-documentation/issues/],
         [gtkmm-documentation], [http://www.gtkmm.org/])
 
 AC_CONFIG_SRCDIR([examples/book/box/packbox.cc])