chore(package): update npm to version 4.0.3

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -66,7 +66,7 @@
     "mocha": "^3.0.0",
     "moment": "^2.16.0",
     "multer": "^1.2.0",
-    "npm": "^3.10.9",
+    "npm": "^4.0.3",
     "numbro": "^1.9.3",
     "path": "^0.12.7",
     "phantomjs": "^2.1.7",