update README_CN.md

zhouaini528 · Mar 4, 2021 · c558171 · c558171
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@@ -11,6 +11,8 @@ USDT合约交易文档地址 [https://binance-docs.github.io/apidocs/futures/cn]
 
 [English Document](https://github.com/zhouaini528/binance-php/blob/master/README.md)
 
+QQ交流群：668421169
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 ### 其他交易所API
 
 [Exchanges](https://github.com/zhouaini528/exchanges-php) 它包含以下所有交易所，强烈推荐使用该SDK。