Raise upper bound for purescript-web-dom

Author: garyb

bower.json

@@ -16,7 +16,7 @@
   ],
   "dependencies": {
     "purescript-js-date": "6",
-    "purescript-web-dom": "2 - 3",
+    "purescript-web-dom": "2 - 4",
     "purescript-web-file": "2",
     "purescript-web-storage": "3"
   }