chore($core): bump vue-router to 3.0.2 (#1207)

packages/@vuepress/core/package.json

@@ -58,7 +58,7 @@
     "url-loader": "^1.0.1",
     "vue": "^2.5.16",
     "vue-loader": "^15.2.4",
-    "vue-router": "^3.0.1",
+    "vue-router": "^3.0.2",
     "vue-server-renderer": "^2.5.16",
     "vue-template-compiler": "^2.5.16",
     "vuepress-html-webpack-plugin": "^3.2.0",

yarn.lock

@@ -9919,9 +9919,9 @@ vue-loader@^15.2.4:
     vue-hot-reload-api "^2.3.0"
     vue-style-loader "^4.1.0"
 
-vue-router@^3.0.1:
-  version "3.0.1"
-  resolved "https://registry.yarnpkg.com/vue-router/-/vue-router-3.0.1.tgz#d9b05ad9c7420ba0f626d6500d693e60092cc1e9"
+vue-router@^3.0.2:
+  version "3.0.2"
+  resolved "https://registry.yarnpkg.com/vue-router/-/vue-router-3.0.2.tgz#dedc67afe6c4e2bc25682c8b1c2a8c0d7c7e56be"
 
 vue-server-renderer@^2.5.16:
   version "2.5.16"