Fix URL typing issue #109

Author: ardatan

package.json

@@ -61,6 +61,7 @@
     ]
   },
   "dependencies": {
+    "@types/node": "12.7.8",
     "graphql-type-json": "0.3.0"
   }
 }

src/mocks.ts

@@ -49,6 +49,8 @@ export const USCurrency = () => 1000;
 export const JSON = () => ({});
 export const JSONObject = () => ({});
 
+import { URL } from 'url';
+
 export {
     URLMock as URL,
     NonNegativeInt as UnsignedInt,