[glade] Update CONTRIBUTING.md to gitlab

[Juan Pablo Ugarte <jpu src gnome org>]

commit 54869190d01e98b1bd1b7bdad1d963bf95e40bad
Author: Juan Pablo Ugarte <juanpablougarte gmail com>
Date:   Sat May 12 10:14:14 2018 -0300

    Update CONTRIBUTING.md to gitlab

 CONTRIBUTING.md | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)
---
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index f43f33df..ff455474 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1,11 +1,6 @@
 Glade official git repository is hosted by the GNOME foundation at
 git.gnome.org
 
-The GNOME contributing guidelines recomend patches to be forwarded
-to GNOME's Bugzilla instance hosted at https://bugzilla.gnome.org,
-as such please do not open Pull Requests (PRs) in others git mirrors
-since there is a good chance they will not get noticed.
-
 Mailing List
 ~~~~~~~~~~~~
 Glade discussion takes place on glade-devel lists ximian com
@@ -14,11 +9,11 @@ To subscribe or to consult archives visit
        http://lists.ximian.com/mailman/listinfo/glade-devel
 
 
-Bugzilla
+GitLab
 ~~~~~~~~
 Glade bugs are tracked at
 
-       http://bugzilla.gnome.org/enter_bug.cgi?product=glade
+       https://gitlab.gnome.org/GNOME/glade
 
 
 GIT