安装rvm 报错，如下图：
Failed to connect to raw.githubusercontent.com port 443: Connection refused
解决方法：
1）终端编辑 sudo vim /etc/hosts
2）添加或修改 199.232.96.133 raw.githubusercontent.com
3）esc推出编辑，输入:wq保存
4）重新执行curl -L get.rvm.io | bash -s stable 安装
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