Bump mongoose from 5.4.2 to 5.7.5

Bumps [mongoose](https://github.com/Automattic/mongoose) from 5.4.2 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@5.4.2...5.7.5)

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

package.json

@@ -19,7 +19,7 @@
   "homepage": "https://github.com/harish551/classic-snake#readme",
   "dependencies": {
     "express": "^4.16.4",
-    "mongoose": "^5.10.17",
+    "mongoose": "^5.7.5",
     "openurl": "^1.1.1",
     "path": "^0.12.7",
     "request": "^2.88.0"