[gnome-games/retro-gtk-0-18: 9/9] flatpak: Ensure we use retro-gtk 0.18

[Alexander Mikhaylenko <alexm src gnome org>]

commit 31aad91501be9fb731f92738e221b982474f3158
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Sat Jan 18 23:31:13 2020 +0100

    flatpak: Ensure we use retro-gtk 0.18
    
    This is needed as retro-gtk will soon break its API on master.

 flatpak/org.gnome.Games.json | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/flatpak/org.gnome.Games.json b/flatpak/org.gnome.Games.json
index bd5986a5..63aab35a 100644
--- a/flatpak/org.gnome.Games.json
+++ b/flatpak/org.gnome.Games.json
@@ -219,6 +219,7 @@
             "sources" : [
                 {
                     "type" : "git",
+                    "branch" : "retro-gtk-0-18",
                     "url" : "https://gitlab.gnome.org/GNOME/retro-gtk.git";
                 }
             ]