message: docs: add more breaking changes notes
diff: Object.values(record.components)
  )
  ```
  + - The `append` argument has been removed. You can manually concatenate the value to an existing `path` instead.
  +- `RouterLink`
  + - `append` prop has been removed as well. Use the same workaround as above.
  + - `event` prop has been removed. Use the `v-slot` API instead. See [RFC](https://github.com/vuejs/rfcs/blob/master/active-rfcs/0021-router-link-scoped-slot.md).
  + - `tag` prop has been removed. Use the `v-slot` API instead. See [RFC](https://github.com/vuejs/rfcs/blob/master/active-rfcs/0021-router-link-scoped-slot.md).
  + - `exact` prop has been removed. The caveat it was fixing is no longer present. See [RFC](https://github.com/vuejs/rfcs/blob/master/active-rfcs/0028-router-active-link.md).
  - If you use a `transition`, you may need to wait for the router to be _ready_ before mounting the app:
  ```js
  app.use(router)
  