[nautilus/gnome-3-28] Flatpak: Use 3.28 branch

[Carlos Soriano <csoriano src gnome org>]

commit 2ef6875d02a78c2a98888973a80e429b1e9f9040
Author: Carlos Soriano <csoriano gnome org>
Date:   Mon Mar 19 12:07:20 2018 +0100

    Flatpak: Use 3.28 branch

 build-aux/flatpak/org.gnome.NautilusDevel.json | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/build-aux/flatpak/org.gnome.NautilusDevel.json b/build-aux/flatpak/org.gnome.NautilusDevel.json
index 083bcdcad..796a8ec62 100644
--- a/build-aux/flatpak/org.gnome.NautilusDevel.json
+++ b/build-aux/flatpak/org.gnome.NautilusDevel.json
@@ -88,7 +88,8 @@
             "sources": [
                 {
                     "type": "git",
-                    "url": "https://gitlab.gnome.org/GNOME/nautilus.git";
+                    "url": "https://gitlab.gnome.org/GNOME/nautilus.git";,
+                    "branch": "gnome-3-28"
                 }
             ]
         }