docs: update readme

Author: hustcc

README.md

@@ -3,7 +3,7 @@
 The simplest, and the best React wrapper for [Apache ECharts](https://github.com/apache/incubator-echarts). 
 
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+[![build](https://github.com/hustcc/echarts-for-react/actions/workflows/build.yml/badge.svg)](https://github.com/hustcc/echarts-for-react/actions/workflows/build.yml)
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