[suggestion] reference @types/chrome as a dependency

[hudidit]

To have better intelligent code completion and type hint, I suggest to reference @types/chrome as a dependency. It also saves time from looking for function signatures in the docs.

建议把 @types/chrome 作为 dependency 引入，这样在 VS Code 里面能自动提示属性名、方法名和函数签名。写起来会快捷很多。

This is a very good boilerplate to start creating a new extension with. Great work!

[lxieyang]

Thanks! Will do!

[lxieyang]

also acknowledged your contribution! https://github.com/lxieyang/chrome-extension-boilerplate-react#intelligent-code-completion
thanks again!