1.[hello:string](https://github.com/wechaty/wechaty/wiki/API#friendrequesthello-string) get content from friendrequest
2.[accept():void](https://github.com/wechaty/wechaty/wiki/API#friendrequestaccept-void) accept the friendrequest
3.[send(contact:Contact,hello:string):void](https://github.com/wechaty/wechaty/wiki/API#friendrequestsendcontact-contact-hello-string-void) send a new friend request
2.[accept():Promise](https://github.com/wechaty/wechaty/wiki/API#friendrequestaccept-void) accept the friendrequest
3.[send(contact:Contact,hello:string):Promise](https://github.com/wechaty/wechaty/wiki/API#friendrequestsendcontact-contact-hello-string-void) send a new friend request