Adding Deprecation Warning to Vue Router

# Introduction In this challenge, we will fix an issue in the `vue-router v3.4.9` code. In version `vue-router v3.4.9`, a warning message was added to the `router.addRoutes()` method stating that it has been removed from Vue Router 4 and to use `router.addRoute()` instead. This challenge requires proficiency in the basic syntax of JavaScript.

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