fix(package): update mongoose to version 5.5.13

Author: greenkeeper[bot]

package.json

@@ -14,7 +14,7 @@
     "helmet": "^3.15.0",
     "iconv-lite": "0.4.24",
     "jsonwebtoken": "8.4.0",
-    "mongoose": "5.5.12",
+    "mongoose": "5.5.13",
     "morgan": "1.9.1",
     "nodemon": "1.19.1",
     "passport": "^0.4.0",