fix: upgrade mongodb from 3.3.4 to 3.5.5 (DeviaVir#2016)

Snyk has created this PR to upgrade mongodb from 3.3.4 to 3.5.5.

See this package in NPM:
https://www.npmjs.com/package/mongodb

See this project in Snyk:
https://app.snyk.io/org/deviavir/project/14e19887-e219-40d4-89b6-6c657bf78942?utm_source=github&utm_medium=upgrade-pr

package.json

@@ -77,7 +77,7 @@
     "minimist": "^1.2.0",
     "mock-require": "^3.0.2",
     "moment": "^2.22.0",
-    "mongodb": "^3.3.4",
+    "mongodb": "^3.5.5",
     "node-bittrex-api": "^0.8.2",
     "node-prowl": "^0.1.7",
     "node-sass": "^4.13.1",