[gnome-notes] libgd: Update submodule reference

[Isaque Galdino de Araujo <igaldino src gnome org>]

commit 7f0abbeb81d799f25b6d91dd54ff7fc33972975b
Author: Isaque Galdino <igaldino gmail com>
Date:   Mon Aug 27 14:56:40 2018 -0300

    libgd: Update submodule reference
    
    libgd git submodule reference was still pointing to git.gnome.org
    instead of gitlab.gnome.org.

 .gitmodules | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitmodules b/.gitmodules
index e91a9d2..fa13636 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,3 @@
 [submodule "subprojects/libgd"]
        path = subprojects/libgd
-       url = git://git.gnome.org/libgd
+       url = https://gitlab.gnome.org/GNOME/libgd.git