Revise badge status

*  because baidu/paddle transfered to paddlepaddle/paddle

README.md

 # PaddlePaddle
 
 
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 Welcome to the PaddlePaddle GitHub.
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 PaddlePaddle (PArallel Distributed Deep LEarning) is an easy-to-use,
 efficient, flexible and scalable deep learning platform, which is originally
 developed by Baidu scientists and engineers for the purpose of applying deep