Bump vue-router from 2.8.1 to 3.1.3

Bumps [vue-router](https://github.com/vuejs/vue-router) from 2.8.1 to 3.1.3.
- [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/v2.8.1...v3.1.3)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -64,7 +64,7 @@
     "fontawesome": "^4.7.2",
     "vue": "^2.4.2",
     "vue-electron": "^1.0.6",
-    "vue-router": "^2.5.3",
+    "vue-router": "^3.1.3",
     "vuetify": "1.0.0",
     "vuex": "^3.1.1"
   },