fix: package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/npm:marked:20170112
- https://snyk.io/vuln/npm:moment:20170905

Latest report for polonel/trudesk:
https://snyk.io/test/github/polonel/trudesk

package.json

@@ -52,9 +52,9 @@
     "js-string-escape": "1.0.1",
     "lodash": "4.17.4",
     "mailparser": "2.0.5",
-    "marked": "0.3.6",
+    "marked": "0.3.7",
     "matchdep": "1.0.1",
-    "moment": "2.18.1",
+    "moment": "2.19.3",
     "mongoose": "4.13.1",
     "mongoose-deep-populate": "3.0.0",
     "morgan": "1.9.0",