add header comments

example/api-ai-bot.js

+#!/usr/bin/env node
 /**
  *
  * Wechaty bot use a ApiAi.com brain

example/ding-dong-bot.js

+#!/usr/bin/env node
+/**
+ *
+ * Wechaty - Wechat for Bot
+ *
+ * Connecting ChatBots
+ * https://github.com/wechaty/wechaty
+ *
+ */
 const {
   Wechaty
   , Config

example/friend-bot.js

+#!/usr/bin/env node
+/**
+ *
+ * Wechaty - Wechat for Bot
+ *
+ * Connecting ChatBots
+ * https://github.com/wechaty/wechaty
+ *
+ */
 const {
   Wechaty
   , Message

example/image-bot.js

+#!/usr/bin/env node
+/**
+ *
+ * Wechaty - Wechat for Bot
+ *
+ * Connecting ChatBots
+ * https://github.com/wechaty/wechaty
+ *
+ */
 const Wechaty = require('..')
 const bot = new Wechaty({ profile: 'example-bot.wechaty.json' })
 

example/roger-bot.js

+#!/usr/bin/env node
+/**
+ *
+ * Wechaty - Wechat for Bot
+ *
+ * Connecting ChatBots
+ * https://github.com/wechaty/wechaty
+ *
+ */
 const Wechaty = require('..')
 const bot = new Wechaty(/* no profile here because roger bot is too noisy */)