Bump mongodb from 3.6.7 to 3.6.8 in /src (#34)

Bumps [mongodb](https://github.com/mongodb/node-mongodb-native) from 3.6.7 to 3.6.8.
- [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@v3.6.7...v3.6.8)

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src/package.json

@@ -17,7 +17,7 @@
   "dependencies": {
     "bson": "latest",
     "level": "^6.0.1",
-    "mongodb": "^3.6.5",
+    "mongodb": "^3.6.8",
     "winston": "^3.3.3"
   },
   "devDependencies": {