fix(package): update update-notifier to version 4.0.0

Closes #47

Author: greenkeeper[bot]

package.json

@@ -44,7 +44,7 @@
     "loud-rejection": "^1.6.0",
     "opn": "^5.4.0",
     "parse-json-config": "^0.3.1",
-    "update-notifier": "^2.1.0",
+    "update-notifier": "^4.0.0",
     "use-config": "^2.0.4",
     "webpack-chain": "^4.11.0",
     "webpack-merge": "^4.1.0",