update Readme

Author: as-kien

README.md

@@ -1,25 +1,6 @@
 Dropbox SDK v2 for PHP
 ======================================================
-[![Latest Stable Version](https://poser.pugx.org/kunalvarma05/dropbox-php-sdk/v/stable?format=flat-square)](https://packagist.org/packages/kunalvarma05/dropbox-php-sdk)
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-[![StyleCI](https://styleci.io/repos/61913555/shield?branch=master)](https://styleci.io/repos/61913555)
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-
-An unofficial PHP SDK to work with the [Dropbox API v2](https://www.dropbox.com/developers/documentation/http/documentation).
-
-<img src="https://cloud.githubusercontent.com/assets/893057/13731118/b7cf0e4e-e987-11e5-942f-13c53d65da35.png">
-
-
-## Get Started
-Head over to the [**Getting Started**](https://github.com/kunalvarma05/dropbox-php-sdk/wiki/Getting-Started) Wiki section to Install and Get started.
-
-
-## API Docs
-[**View API Docs**](https://kunalvarma05.github.io/dropbox-php-sdk/)
-
-
-## License
-Dropbox PHP Client is licensed under The MIT License (MIT).
+We had used [Dropbox API v2](https://www.dropbox.com/developers/documentation/http/documentation) 
+which had not been updated for a long time. 
+So we forked this repository to upgrade all the dependencies by ourselves.