add Apache License NOTICE

LICENSE

@@ -186,7 +186,8 @@
       same "printed page" as the copyright notice for easier
       identification within third-party archives.
 
-   Copyright 2016-2018 Huan LI (李卓桓) <zixia@zixia.net>
+   Copyright 2016 Huan LI (李卓桓) <https://github.com/huan> and
+                  Wechaty Contributors <https://github.com/wechaty>.
 
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.

NOTICE

+Wechaty Chatbot SDK
+Copyright 2016 Huan (李卓桓) and Wechaty Contributors.
+
+This product includes software developed at
+The Wechaty Organization (https://github.com/wechaty).
+
+This software contains code derived from the Stackoverflow,
+including various modifications by GitHub.

scripts/update-license.ts

@@ -16,9 +16,10 @@ import { promisify }          from 'util'
 import * as globCallback      from 'glob'
 
 const LICENSE = `/**
- *   Wechaty - https://github.com/wechaty/wechaty
+ *   Wechaty Chatbot SDK - https://github.com/wechaty/wechaty
  *
- *   @copyright 2016-2018 Huan LI <zixia@zixia.net>
+ *   @copyright 2016 Huan LI (李卓桓) <https://github.com/huan>, and
+ *                   Wechaty Contributors <https://github.com/wechaty>.
  *
  *   Licensed under the Apache License, Version 2.0 (the "License");
  *   you may not use this file except in compliance with the License.