一键更新清理 brew update && brew upgrade && brew cleanup
brew tap caskroom/caskbrew cask install 安装
brew cask uninstall 卸载Brew 更新软件很简单 。但是 brew cask 就没这么简单了。
有难题，总会有人解决难题。https://github.com/buo/homebrew-cask-upgrade
brew tap buo/cask-upgrade更新所有过时应用：
brew cu更新指定应用：
brew cu [CASK]