错误再现：
[!] Oh no, an error occurred.
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[!] Smart quotes were detected and ignored in your Podfile. To avoid issues in the future, you should not use TextEdit for editing it. If you are not using TextEdit, you should turn off smart quotes in your editor of choice.
[!] 'RongCloudIM' uses the unencrypted http protocol to transfer the Pod. Please be sure you're in a safe network with only trusted hosts in there. Please reach out to the library author to notify them of this security issue.
解决方案：
一、首先查看一下自己的ruby，看是不是 https://gems.ruby-china.com/
gem sources -l
二、如果不是 https://gems.ruby-china.com/ 的源的话，就添加新源，卸载旧源；
gem sources --add https://gems.ruby-china.com/ --remove https://gems.ruby-china.org/
三、再次查看自己的ruby，看是否替换成功。如果显示是https://gems.ruby-china.com/则说明替换成功。
gem sources -l
四、重新初始化安装Pod。
sudo gem install -n /usr/local/bin cocoapods
五、成功之后查看一下版本有无,现在最新的是 1.5.3 版本。
pod --version
六、如果没什么问题的话吗，就cd到自己的工程目录下进行更新第三方库
pod install --verbose --no-repo-update
