Merge pull request #1 from VueZone/dependabot/npm_and_yarn/mongoose-5.7.7

Bump mongoose from 4.13.19 to 5.7.7

Author: houko

package.json

@@ -18,7 +18,7 @@
     "ejs": "^2.5.6",
     "express": "~4.14.1",
     "jade": "~1.11.0",
-    "mongoose": "^4.10.3",
+    "mongoose": "^5.7.7",
     "morgan": "~1.7.0",
     "serve-favicon": "~2.3.2",
     "vue": "^2.2.6",