ungrade koa-markdown to use remarkable, close #482
ungrade koa-markdown to use remarkable, close #482

yufi113/cnpmjs.org,chinakids/cnpmjs.org,marvinlee/cnpmjs.org,marvinlee/cnpmjs.org,marvinlee/cnpmjs.org,yufi113/cnpmjs.org,yufi113/cnpmjs.org,irachex/cnpmjs.org,chinakids/cnpmjs.org,irachex/cnpmjs.org,limianwang/cnpmjs.org,limianwang/cnpmjs.org,limianwang/cnpmjs.org,irachex/cnpmjs.org,chinakids/cnpmjs.org