[gnome-music/wip/mschraal/3-30-flatpak-tracker-2.1] flatpak: Stick Tracker on the 2.1 branch

[Marinus Schraal <mschraal src gnome org>]

commit ae02f798d64e016918de4b9d14854d36d7d8ff55
Author: Marinus Schraal <mschraal gnome org>
Date:   Tue Sep 11 00:00:54 2018 +0200

    flatpak: Stick Tracker on the 2.1 branch
    
    Keeps in line with the development cycle and still builds with autotools.

 org.gnome.Music.json | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/org.gnome.Music.json b/org.gnome.Music.json
index a3d8a768..d9ee34fb 100644
--- a/org.gnome.Music.json
+++ b/org.gnome.Music.json
@@ -74,7 +74,8 @@
             "sources": [
                 {
                     "type": "git",
-                    "url": "https://gitlab.gnome.org/GNOME/tracker.git";
+                    "url": "https://gitlab.gnome.org/GNOME/tracker.git";,
+                    "branch": "tracker-2.1"
                 }
             ]
         },