fix: upgrade moment from 2.15.1 to 2.30.0

Snyk has created this PR to upgrade moment from 2.15.1 to 2.30.0.

See this package in npm:
https://www.npmjs.com/package/moment

See this project in Snyk:
https://app.snyk.io/org/harry.kimpel/project/9dff5636-7f9c-4ab7-b35d-0f83ae4a1e5b?utm_source=github&utm_medium=referral&page=upgrade-pr

package.json

@@ -32,7 +32,7 @@
     "lodash": "4.17.4",
     "marked": "0.3.5",
     "method-override": "latest",
-    "moment": "2.15.1",
+    "moment": "2.30.0",
     "mongodb": "^3.5.9",
     "mongoose": "4.2.4",
     "morgan": "latest",