Update README.md

Former-commit-id: b324fb7

Author: Birkemose

README.md

@@ -1,4 +1,4 @@
-<img src="http://www.cocos2d-iphone.org/downloads/cocos2d_logo.png">
+<img src="http://www.cocos2d-iphone.org/blog/wp-content/uploads/2014/01/angry.png">
 
 cocos2d for iPhone
 ==================
@@ -109,4 +109,4 @@ Download from Github
 [3]: http://www.cocos2d-iphone.org/wiki/doku.php/faq#i_found_a_bug_i_have_an_enhancement_proposal_what_should_i_do "contributing to cocos2d"
 [4]: http://www.cocos2d-iphone.org/forum "cocos2d for iPhone forum"
 [5]: https://github.com/cocos2d/cocos2d-iphone/archive/develop-v3.zip
-[6]: http://www.chipmunk-physics.net
+[6]: http://www.chipmunk-physics.net