chore(deps): update dependency mongoose to v5.13.15 [security]

Author: renovate[bot]

package-lock.json

@@ -84,7 +84,7 @@
     "lint-staged": "9.5.0",
     "lodash.template": "4.5.0",
     "mocha": "6.2.2",
-    "mongoose": "5.8.5",
+    "mongoose": "5.13.15",
     "nyc": "15.0.0",
     "prettier": "1.19.1",
     "rimraf": "3.0.0"