Update address to confirm with v4

Apologies if I've got this wrong, but I think that according to v4, dependencies should be a string array in this case.

Author: birdsarah

address

@@ -12,7 +12,7 @@
     },
     "required": ["locality", "region", "country-name"],
     "dependencies": {
-        "post-office-box": "street-address",
-        "extended-address": "street-address"
+        "post-office-box": ["street-address"],
+        "extended-address": ["street-address"]
     }
 }