fix(example): keep the order of `say` by add `await`
fix(example): keep the order of `say` by add `await`

Chatie/wechaty,mukaiu/wechaty,wechaty/wechaty,mukaiu/wechaty,mukaiu/wechaty,lijiarui/wechaty,zixia/wechaty,Chatie/wechaty,Chatie/wechaty,wechaty/wechaty,binsee/wechaty,lijiarui/wechaty,binsee/wechaty,binsee/wechaty,wechaty/wechaty,zixia/wechaty