docs: add using-with-vue-router

Author: eddyerburgh

docs/en/SUMMARY.md

@@ -6,7 +6,8 @@
   * [Choosing a test runner](guides/choosing-a-test-runner.md)
   * [Testing SFCs with Jest](guides/testing-SFCs-with-jest.md)
   * [Testing SFCs with Mocha + webpack](guides/testing-SFCs-with-mocha-webpack.md)
-  * [Using with Vuex](guides/using-with-vuex.md)
+  * [Using with vue-router](guides/using-with-vuex.md)
+  * [Using with vuex](guides/using-with-vuex.md)
 * [API](api/README.md)
   * [mount](api/mount.md)
   * [shallow](api/shallow.md)