📝 Update README

README.md

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 Go 语言常用工具库，这个轱辘还算圆！
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-<a title="Build Status" target="_blank" href="https://github.com/88250/gulu/actions/workflows/gotest.yml"><img src="https://img.shields.io/github/workflow/status/88250/gulu/Go%20Test?style=flat-square"></a>
+<a title="Build Status" target="_blank" href="https://github.com/88250/gulu/actions/workflows/gotest.yml"><img src="https://img.shields.io/github/actions/workflow/status/88250/gulu/Go%20Test?style=flat-square"></a>
 <a title="GoDoc" target="_blank" href="https://godoc.org/github.com/88250/gulu"><img src="http://img.shields.io/badge/godoc-reference-5272B4.svg?style=flat-square"></a>
 <a title="Go Report Card" target="_blank" href="https://goreportcard.com/report/github.com/88250/gulu"><img src="https://goreportcard.com/badge/github.com/88250/gulu?style=flat-square"></a>
 <a title="Coverage Status" target="_blank" href="https://coveralls.io/github/88250/gulu"><img src="https://img.shields.io/coveralls/github/88250/gulu.svg?style=flat-square&color=CC9933"></a>