chore: update readme logo

README.md

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 <a href="https://github.com/BaguaSys/bagua/stargazers"><img src="https://reporoster.com/stars/BaguaSys/bagua" /><a/>
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 Bagua is a deep learning training acceleration framework for PyTorch developed by [AI platform@Kuaishou Technology](https://www.kuaishou.com/en) and [DS3 Lab@ETH](https://ds3lab.inf.ethz.ch/). Bagua currently supports: