Error fetching https://gems.ruby-china.org/: bad response Not Found 404 - Dev

使用 cocoapods 时遇到了如下问题：

Error fetching https://gems.ruby-china.org/:
    bad response Not Found 404 (https://gems.ruby-china.org/specs.4.8.gz)

cocoapods 的原镜像地址 https://gems.ruby-china.org/ 访问 404；
将其旧的镜像地址变更为 https://gems.ruby-china.com/ 地址即可;
具体操作如下：

gem sources -l
gem sources --remove https://gems.ruby-china.org/
gem sources --add https://gems.ruby-china.com/

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