get rid of unnecessary `ready()` call

example/contact-bot.ts

@@ -81,7 +81,6 @@ async function main() {
   const MAX = 17
   for (let i = 0; i < contactList.length; i++ ) {
     const contact = contactList[i]
-    await contact.ready()
 
     if (!contact.weixin()) {
       await contact.refresh()

example/friend-bot.ts

@@ -66,7 +66,6 @@ bot
   m.set('to', 'filehelper')
 
   try {
-    await contact.ready()
     logMsg = 'received `friend` event from ' + contact.get('name')
     m.set('content', logMsg)
     bot.send(m)

example/gist-bot/on-message.ts

@@ -16,11 +16,6 @@ export async function onMessage(message: Message): Promise<void> {
     const sender    = message.from()
     const content   = message.content()
 
-    if (room) {
-      await room.ready()
-    }
-    await sender.ready()
-
     console.log((room ? '[' + room.topic() + ']' : '')
                 + '<' + sender.name() + '>'
                 + ':' + message.toStringDigest()

example/room-bot.ts

@@ -369,7 +369,6 @@ async function createDingRoom(contact): Promise<any> {
       return
     }
 
-    await helperContact.ready()
     log.info('Bot', 'getHelperContact() ok. got: %s', helperContact.name())
 
     const contactList = [contact, helperContact]