安装 oh-my-zsh 插件

macOS的用户安装zsh-autosuggestions等没有自带的插件，基本如下操作：

git clone https://github.com/zsh-users/zsh-autosuggestions $ZSH_CUSTOM/plugins/zsh-autosuggestions
vi ~/.zshrc

编辑该文件

plugins=(
  git
  zsh-autosuggestions
)

最后更新配置文件

source ~/.zshrc