[swell-foop] snap: Updated for latest gnome snapcraft extension

[Ken VanDine <kvandine src gnome org>]

commit 543400714ebe941a832d51b0c103616b9846e22d
Author: Ken VanDine <ken vandine canonical com>
Date:   Tue Jun 2 11:31:03 2020 -0400

    snap: Updated for latest gnome snapcraft extension

 snap/snapcraft.yaml | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)
---
diff --git a/snap/snapcraft.yaml b/snap/snapcraft.yaml
index 08f560b..0e2454c 100644
--- a/snap/snapcraft.yaml
+++ b/snap/snapcraft.yaml
@@ -30,7 +30,7 @@ slots:
 apps:
   swell-foop:
     command: usr/bin/swell-foop
-    extensions: [gnome-3-28]
+    extensions: [gnome-3-34]
     plugs:
       - gsettings
       - opengl
@@ -61,10 +61,13 @@ parts:
     organize:
       snap/swell-foop/current/usr: usr
     build-packages:
-      - gettext
-      - itstool
-      - libclutter-gtk-1.0-dev
-      - libgtk-3-dev
-      - valac
+      - libgudev-1.0-dev
+      - libgnome-games-support-1-dev
+
+  libs:
+    after: [swell-foop]
+    plugin: nil
     stage-packages:
-      - libclutter-gtk-1.0-0
+      - libgnome-games-support-1-3
+    prime:
+      - usr/lib/*/libgnome-games*