Raise upper bound for purescript-web-dom

Author: garyb

bower.json

@@ -16,7 +16,7 @@
   ],
   "dependencies": {
     "purescript-naturals": "^3.0.0",
-    "purescript-web-dom": "^3.0.0"
+    "purescript-web-dom": "3 - 4"
   },
   "devDependencies": {
     "purescript-test-unit": "^15.0.0",