doc: update README.md.
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		@@ -406,8 +406,8 @@ Quick Reference
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<a href="https://github.com/greyhao" title="greyhao">
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  <img src="https://avatars.githubusercontent.com/u/107107440?v=4" width="42;" alt="greyhao"/>
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</a>
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<a href="https://github.com/sunny0826" title="guoxudong">
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  <img src="https://avatars.githubusercontent.com/u/24563928?v=4" width="42;" alt="guoxudong"/>
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<a href="https://github.com/sunny0826" title="Xudong Guo">
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  <img src="https://avatars.githubusercontent.com/u/24563928?v=4" width="42;" alt="Xudong Guo"/>
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</a>
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<a href="https://github.com/hua03" title="hua03">
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  <img src="https://avatars.githubusercontent.com/u/19561959?v=4" width="42;" alt="hua03"/>
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