Run the versions I specify in the course

You need to run the versions I specify in the course to follow along with the course. When you run `npm install`, you will receive warnings. You can ignore the warnings. It will run fine. To switch to the versions I specify in the course, do this:

1. Delete node_modules
2. Copy the dependencies and devDependencies from [the package.json that I provide in the course](https://gist.github.com/coryhouse/29bd1029b623beb4c7f79b748dcba844)
3. Run this to install dependencies: `npm install`
4. Once you complete the course, I show how to update to the latest versions [here](https://github.com/coryhouse/javascript-development-environment/pull/7).

首先，将课程中关于 dependency 和 devDependency 的说明与 issue 中引用的 package.json 进行比较。更新面向课程的相关指导，使读者能够安装指定版本，并了解可以忽略警告；确认这些说明仍与链接的更新指导一致。

由索引模型根据 Issue 内容生成。