[fractal] flatpak: Use 3.36 Sdk instead of master

[Daniel Garcia Moreno <danigm src gnome org>]

commit c0b9194e179c86e841e72d55fee7f4e84446054e
Author: Daniel García Moreno <dani danigm net>
Date:   Wed May 6 17:55:44 2020 +0200

    flatpak: Use 3.36 Sdk instead of master
    
    The master Sdk doesn't have the rust-stable extension so we should use
    3.36 until master has this or until we find another way to provide the
    rust compiler to the Sdk.

 flatpak/org.gnome.Fractal.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/flatpak/org.gnome.Fractal.json b/flatpak/org.gnome.Fractal.json
index 9eaaafbf..cc4cc6fa 100644
--- a/flatpak/org.gnome.Fractal.json
+++ b/flatpak/org.gnome.Fractal.json
@@ -1,7 +1,7 @@
 {
     "app-id" : "org.gnome.FractalDevel",
     "runtime" : "org.gnome.Platform",
-    "runtime-version" : "master",
+    "runtime-version" : "3.36",
     "sdk" : "org.gnome.Sdk",
     "sdk-extensions" : [
         "org.freedesktop.Sdk.Extension.rust-stable"