Revert "Update dependency vue-router to v4"

This reverts commit 4ffdd5f.

Author: g3force

package.json

@@ -18,7 +18,7 @@
     "v-hotkey": "0.9.0",
     "vue": "2.6.14",
     "vue-native-websocket": "2.0.15",
-    "vue-router": "4.0.16",
+    "vue-router": "3.5.4",
     "vuex": "3.6.2"
   },
   "devDependencies": {

yarn.lock

@@ -1163,11 +1163,6 @@
   optionalDependencies:
     prettier "^1.18.2 || ^2.0.0"
 
-"@vue/devtools-api@^6.0.0":
-  version "6.1.4"
-  resolved "https://registry.yarnpkg.com/@vue/devtools-api/-/devtools-api-6.1.4.tgz#b4aec2f4b4599e11ba774a50c67fa378c9824e53"
-  integrity sha512-IiA0SvDrJEgXvVxjNkHPFfDx6SXw0b/TUkqMcDZWNg9fnCAHbTpoo59YfJ9QLFkwa3raau5vSlRVzMSLDnfdtQ==
-
 "@vue/preload-webpack-plugin@^1.1.0":
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/@vue/preload-webpack-plugin/-/preload-webpack-plugin-1.1.2.tgz#ceb924b4ecb3b9c43871c7a429a02f8423e621ab"
@@ -8267,12 +8262,10 @@ vue-native-websocket@2.0.15:
   resolved "https://registry.yarnpkg.com/vue-native-websocket/-/vue-native-websocket-2.0.15.tgz#e94af2bb7f54beeaac5281d953751d2858b76964"
   integrity sha512-i3UvRL99rY8ytV0VJzcWDwY3fRPoeh2fGYvB9862JocEQOx/oCw/VtPIUwP4tSzmzJvJZNkvP71wfhfS1sVhxQ==
 
-vue-router@4.0.16:
-  version "4.0.16"
-  resolved "https://registry.yarnpkg.com/vue-router/-/vue-router-4.0.16.tgz#9477beeeef36e80e04d041a1738801a55e6e862e"
-  integrity sha512-JcO7cb8QJLBWE+DfxGUL3xUDOae/8nhM1KVdnudadTAORbuxIC/xAydC5Zr/VLHUDQi1ppuTF5/rjBGzgzrJNA==
-  dependencies:
-    "@vue/devtools-api" "^6.0.0"
+vue-router@3.5.4:
+  version "3.5.4"
+  resolved "https://registry.yarnpkg.com/vue-router/-/vue-router-3.5.4.tgz#c453c0b36bc75554de066fefc3f2a9c3212aca70"
+  integrity sha512-x+/DLAJZv2mcQ7glH2oV9ze8uPwcI+H+GgTgTmb5I55bCgY3+vXWIsqbYUzbBSZnwFHEJku4eoaH/x98veyymQ==
 
 vue-style-loader@^4.1.0:
   version "4.1.3"