update logo and copyright

Author: longbai

README.md

@@ -2,7 +2,7 @@
 
 [![Build Status](https://api.travis-ci.org/qiniu/php-sdk.png?branch=master)](https://travis-ci.org/qiniu/php-sdk)
 
-[![Qiniu Logo](http://qiniutek.com/images/logo-2.png)](http://qiniu.com/)
+[![Qiniu Logo](http://qiniu-brand.qiniudn.com/5/logo-white-195x105.png)](http://www.qiniu.com/)
 
 
 ## 下载
@@ -34,7 +34,7 @@
 
 ## 许可证
 
-Copyright (c) 2012 qiniu.com
+Copyright (c) 2012-2014 qiniu.com
 
 基于 MIT 协议发布: