Update README.md

Author: lvyahui8

README.md

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 ## 背景与目的
 
 在开发后台接口时, 为了开发效率, 我们往往习惯编写串行执行的代码, 去调用不同的接口, 即使这些接口之间并无依赖,  这使得最后开发的接口性能低下, 且数据不方便复用