[gnome-todo] flatpak: Set build system

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 6f703657795741ff0f75d83870c755f57a982d42
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Tue Feb 27 16:53:14 2018 -0300

    flatpak: Set build system

 org.gnome.Todo.json | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/org.gnome.Todo.json b/org.gnome.Todo.json
index 002b595..be7eabd 100644
--- a/org.gnome.Todo.json
+++ b/org.gnome.Todo.json
@@ -133,6 +133,7 @@
         },
         {
             "name" : "gnome-todo",
+            "buildsystem" : "meson",
             "sources" : [
                 {
                     "type" : "git",