[gnome-nibbles/arnaudb/wip/gtk4] Try to fix CI.

[Arnaud B. <arnaudb src gnome org>]

commit 62ce8a3a5def814bd7b8dbe6f44e1565aac1d12d
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Tue Jun 16 18:35:17 2020 +0200

    Try to fix CI.

 org.gnome.Nibbles.json | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/org.gnome.Nibbles.json b/org.gnome.Nibbles.json
index 124f894..de43380 100644
--- a/org.gnome.Nibbles.json
+++ b/org.gnome.Nibbles.json
@@ -53,7 +53,8 @@
             "sources": [
                 {
                     "type": "git",
-                    "url": "https://gitlab.gnome.org/GNOME/libgnome-games-support.git";
+                    "url": "https://gitlab.gnome.org/GNOME/libgnome-games-support.git";,
+                    "branch": "arnaudb/wip/gtk4"
                 }
             ]
         },
@@ -63,7 +64,8 @@
             "sources": [
                 {
                     "type": "git",
-                    "url": "https://gitlab.gnome.org/GNOME/gnome-nibbles.git";
+                    "url": "https://gitlab.gnome.org/GNOME/gnome-nibbles.git";,
+                    "branch": "arnaudb/wip/gtk4"
                 }
             ]
         }