为rust配置国内/科大源

为rust crates.io换上国内中科大的源

1. 进入当前用户的 .cargo 目录 cd ~/.cargo

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2. 新建名字为 config 的文件

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3. 编辑 config 文件写入

[source.crates-io]
registry = "https://github.com/rust-lang/crates.io-index"
replace-with = 'ustc'
[source.ustc]
registry = "git://mirrors.ustc.edu.cn/crates.io-index"