[gnome-sound-recorder] Flatpak: build using master runtime

[Felipe Borges <felipeborges src gnome org>]

commit 23da9eab85dfe13a0f15fe69bcf908b9c78ab57e
Author: Bilal Elmoussaoui <bil elmoussaoui gmail com>
Date:   Fri Jan 11 10:48:45 2019 +0000

    Flatpak: build using master runtime

 org.gnome.SoundRecorder.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/org.gnome.SoundRecorder.json b/org.gnome.SoundRecorder.json
index 49950d9..8c82157 100644
--- a/org.gnome.SoundRecorder.json
+++ b/org.gnome.SoundRecorder.json
@@ -1,7 +1,7 @@
 {
     "app-id" : "org.gnome.SoundRecorder",
     "runtime" : "org.gnome.Platform",
-    "runtime-version" : "3.28",
+    "runtime-version" : "master",
     "sdk" : "org.gnome.Sdk",
     "command" : "gnome-sound-recorder",
     "tags" : [