revert useless code in last commit; add _cache_set(_, _, maxAge) to support zh-asoiaf-wiki/zh.asoiaf.wechat#7
revert useless code in last commit; add _cache_set(_, _, maxAge) to support zh-asoiaf-wiki/zh.asoiaf.wechat#7

HuijiWiki/node-huiji