$ cargo install rnrm
$ rnrm ls
* npm --------- https://registry.npmjs.org/
npmMirror --- https://skimdb.npmjs.com/registry/
taobao ------ https://registry.npmmirror.com/
tencent ----- https://mirrors.cloud.tencent.com/npm/
test -------- http://test.com
yarn -------- https://registry.yarnpkg.com/
$ rnrm use npm
Registry has been set to: https://registry.npmjs.org/