BREAKING CHANGES v0.16: FriendRequest class will be replaced with Friendship
Created by: huan
Before
wechaty.FriendRequest.send(contact)
wechaty.on('friend', (contact: Contact, request: FriendRequest) => { /* ... */ })
After
wechaty.Friendship.verify(contact)
wechaty.on('friendship', (friendship: Friendship) => { /* ... */ })