Add 'archive' tag to Skeleton Key (#2084)

Author: dkhamsing

contents.json

@@ -9993,7 +9993,7 @@
         "game"
       ],
       "tags": [
-        "objc"
+        "objc", "archive"
       ],
       "description": "A puzzle game where you must shift keys around a board to unlock treasure chests",
       "source": "https://github.com/insurgentgames/Skeleton-Key-iOS",