build(deps): update vue-router requirement from 3.0.2 to 3.0.6

Updates the requirements on [vue-router](https://github.com/vuejs/vue-router) to permit the latest version.
- [Release notes](https://github.com/vuejs/vue-router/releases)
- [Changelog](https://github.com/vuejs/vue-router/blob/dev/CHANGELOG.md)
- [Commits](https://github.com/vuejs/vue-router/compare/v3.0.2...v3.0.6)

package.json

@@ -64,7 +64,7 @@
     "tui-editor": "1.3.3",
     "vue": "2.6.10",
     "vue-count-to": "1.0.13",
-    "vue-router": "3.0.2",
+    "vue-router": "3.0.6",
     "vue-splitpane": "1.0.4",
     "vuedraggable": "2.20.0",
     "vuex": "3.1.0",