Update README.md

README.md

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 <img src="./paddlex.png" width = "200" height = "31" alt="PaddleX" align=center />
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 [![License](https://img.shields.io/badge/license-Apache%202-blue.svg)](LICENSE)
 [![Version](https://img.shields.io/github/release/PaddlePaddle/PaddleX.svg)](https://github.com/PaddlePaddle/PaddleX/releases)