Update README.md

README.md

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 Qiniu Text Processing Libraries for Go
 ===============
 
-[![LICENSE](https://img.shields.io/github/license/qiniu/text.svg)](https://github.com/qiniu/text/blob/master/LICENSE)
+[![LICENSE](https://img.shields.io/github/license/qiniu/text.svg)](https://github.com/qiniu/text/blob/main/LICENSE)
 [![Build Status](https://github.com/qiniu/text/actions/workflows/go.yml/badge.svg)](https://github.com/qiniu/text/actions/workflows/go.yml)
 [![Go Report Card](https://goreportcard.com/badge/github.com/qiniu/text)](https://goreportcard.com/report/github.com/qiniu/text)
 [![GitHub release](https://img.shields.io/github/v/tag/qiniu/text.svg?label=release)](https://github.com/qiniu/text/releases)
-[![Coverage Status](https://codecov.io/gh/qiniu/text/branch/master/graph/badge.svg)](https://codecov.io/gh/qiniu/text)
+[![Coverage Status](https://codecov.io/gh/qiniu/text/branch/main/graph/badge.svg)](https://codecov.io/gh/qiniu/text)
 [![GoDoc](https://pkg.go.dev/badge/github.com/qiniu/text.svg)](https://pkg.go.dev/github.com/qiniu/text)
 
 [![Qiniu Logo](http://open.qiniudn.com/logo.png)](http://www.qiniu.com/)
 
 # 使用文档
 
-* [TPL Doc](https://github.com/qiniu/text/tree/master/tpl)
+* [TPL Doc](https://github.com/qiniu/text/tree/main/tpl)
 * [godoc.org/github.com/qiniu/text/tpl](http://godoc.org/github.com/qiniu/text/tpl)