rename zh-cn with zh-hans #74
Description
According to GitbookIO/gitbook#926, the $lang zh-cn have been removed from Gitbook, we should use zh-hans instead.
zh-tw should be zh-hant but gitbook does not support now.
{{ message }}
According to GitbookIO/gitbook#926, the $lang zh-cn have been removed from Gitbook, we should use zh-hans instead.
zh-tw should be zh-hant but gitbook does not support now.