Bump mongoose from 5.13.3 to 5.13.20

Bumps [mongoose](https://github.com/Automattic/mongoose) from 5.13.3 to 5.13.20.
- [Release notes](https://github.com/Automattic/mongoose/releases)
- [Changelog](https://github.com/Automattic/mongoose/blob/master/CHANGELOG.md)
- [Commits](Automattic/mongoose@5.13.3...5.13.20)

---
updated-dependencies:
- dependency-name: mongoose
  dependency-type: direct:production
...

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

Author: dependabot[bot]

package-lock.json

@@ -35,7 +35,7 @@
     "express": "^4.16.3",
     "jsrender": "^0.9.90",
     "lodash": "^4.17.11",
-    "mongoose": "^5.2.17",
+    "mongoose": "^5.13.20",
     "morgan": "^1.9.1",
     "nodemailer": "^4.6.7",
     "nodemailer-smtp-transport": "^2.7.4",