upgrade state-switch to support rxjs
upgrade state-switch to support rxjs

zixia/wechaty,mukaiu/wechaty,mukaiu/wechaty,binsee/wechaty,binsee/wechaty,wechaty/wechaty,binsee/wechaty,mukaiu/wechaty,wechaty/wechaty,zixia/wechaty,wechaty/wechaty