一 背景
Mac 上，使用brew 安装 软件时 ，提示报错如下：Error searching on GitHub: GitHub API Error: Bad credentials The GitHub credentials in the macOS key，具体报错如下：
Error: GitHub {
"message": "Bad credentials",
"documentation_url": "https://developer.github.com/v3"
}
The GitHub credentials in the OS X keychain may be invalid.
Clear them with:
printf "protocol=https\nhost=gith