fix router version

Author: pleerock

index.html

@@ -44,7 +44,7 @@
 <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
 <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js" integrity="sha384-B0UglyR+jN6CkvvICOB2joaf5I4l3gm9GU6Hc1og6Ls7i6U/mkkaduKaBhlAXv9k" crossorigin="anonymous"></script>
 <script src="https://unpkg.com/vue@2/dist/vue.min.js"></script> <!--node_modules/vue/dist/vue.min.js-->
-<script src="https://unpkg.com/vue-router@3/dist/vue-router.js"></script> <!--node_modules/vue-router/dist/vue-router.min.js-->
+<script src="https://unpkg.com/vue-router@2/dist/vue-router.js"></script> <!--node_modules/vue-router/dist/vue-router.min.js-->
 <script src="https://unpkg.com/vue-i18n@8.23.0/dist/vue-i18n.js"></script><!--node_modules/vue-i18n/dist/vue-i18n.js-->
 <script src="https://unpkg.com/vue-cookies/vue-cookies.js"></script><!--node_modules/vue-cookies/dist/vue-cookies.js-->
 <script src="https://cdnjs.cloudflare.com/ajax/libs/showdown/1.9.1/showdown.min.js"></script> <!--node_modules/showdown/dist/showdown.js-->