Bump mongoose from 5.6.7 to 5.7.5 in /pretty

Bumps [mongoose](https://github.com/Automattic/mongoose) from 5.6.7 to 5.7.5.
- [Release notes](https://github.com/Automattic/mongoose/releases)
- [Changelog](https://github.com/Automattic/mongoose/blob/master/History.md)
- [Commits](Automattic/mongoose@5.6.7...5.7.5)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

pretty/package-lock.json

@@ -17,7 +17,7 @@
     "dotenv": "^8.2.0",
     "express": "^4.16.4",
     "mocha": "^6.2.0",
-    "mongoose": "^5.6.7",
+    "mongoose": "^5.7.5",
     "node": "^11.12.0",
     "nodeman": "^1.1.2",
     "supertest": "^4.0.2"