fix(package): update update-notifier to version 2.3.0

Closes #106

Author: greenkeeper[bot]

package.json

@@ -35,7 +35,7 @@
     "request": "^2.58.0",
     "request-promise": "^4.1.1",
     "travis-ci": "^2.1.1",
-    "update-notifier": "^1.0.2",
+    "update-notifier": "^2.3.0",
     "user-home": "^2.0.0",
     "validator": "^6.1.0"
   },