Bump mongodb from 2.2.36 to 3.6.2

Bumps [mongodb](https://github.com/mongodb/node-mongodb-native) from 2.2.36 to 3.6.2.
- [Release notes](https://github.com/mongodb/node-mongodb-native/releases)
- [Changelog](https://github.com/mongodb/node-mongodb-native/blob/3.6/CHANGES_3.0.0.md)
- [Commits](mongodb/node-mongodb-native@v2.2.36...v3.6.2)

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -70,7 +70,7 @@
     "method-override": "^2.3.0",
     "moment": "^2.10.2",
     "moment-timezone": "^0.5.0",
-    "mongodb": "^2.0.33",
+    "mongodb": "^3.6.2",
     "morgan": "^1.6.1",
     "mousetrap": "^1.6.0",
     "node-emoji": "^1.4.1",