[gnome-weather] Flatpak: use meson to build gnome-weather

[Jordan Petridis <jpetridis src gnome org>]

commit b1c0340734120f5f18dffafa81fb61911dbca84d
Author: Jordan Petridis <jpetridis gnome org>
Date:   Sun Feb 10 19:31:50 2019 +0200

    Flatpak: use meson to build gnome-weather

 org.gnome.Weather-unstable.json | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/org.gnome.Weather-unstable.json b/org.gnome.Weather-unstable.json
index bd961f8..fadac0b 100644
--- a/org.gnome.Weather-unstable.json
+++ b/org.gnome.Weather-unstable.json
@@ -83,6 +83,7 @@
         },
         {
             "name" : "gnome-weather",
+            "buildsystem" : "meson",
             "sources" : [
                 {
                     "type" : "git",