fix: dont sync if upstream is npm registry
fix: dont sync if upstream is npm registry

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