fix: upgrade vue-router from 3.0.1 to 3.1.6

Snyk has created this PR to upgrade vue-router from 3.0.1 to 3.1.6.

See this package in NPM:
https://www.npmjs.com/package/vue-router

See this project in Snyk:
https://app.snyk.io/org/luisalejandro/project/709c2db5-08fb-4d5f-88a4-53be6eecb157?utm_source=github&utm_medium=upgrade-pr

Author: snyk-bot

package-lock.json

@@ -124,7 +124,7 @@
     "vinyl-buffer": "1.0.1",
     "vinyl-source-stream": "2.0.0",
     "vue": "2.6.11",
-    "vue-router": "3.0.1",
+    "vue-router": "3.1.6",
     "vueify": "9.4.1",
     "watchify": "3.11.1"
   },