Add dependencies to winston logging

package.json

@@ -34,7 +34,9 @@
     "passport-local": "1.0.0",
     "request": "2.69.0",
     "slug": "0.9.1",
-    "underscore": "1.8.3"
+    "underscore": "1.8.3",
+    "winston": "^3.3.3",
+    "winston-mongodb": "^5.0.5"
   },
   "devDependencies": {
     "newman": "^3.8.2",