docs: simplify GitHub Actions.

README.md

@@ -5,8 +5,8 @@
 [![Contributors](https://img.shields.io/github/contributors/Tencent/spring-cloud-tencent)](https://github.com/Tencent/spring-cloud-tencent/graphs/contributors)
 [![License](https://img.shields.io/badge/License-BSD%203--Clause-blue.svg)](https://opensource.org/licenses/BSD-3-Clause)
 
-[![Junit Test](https://github.com/Tencent/spring-cloud-tencent/actions/workflows/junit.yml/badge.svg?branch=2021)](https://github.com/Tencent/spring-cloud-tencent/actions/workflows/junit.yml)
-[![codecov.io](https://codecov.io/gh/Tencent/spring-cloud-tencent/branch/2021/graph/badge.svg)](https://codecov.io/gh/Tencent/spring-cloud-tencent?branch=2021)
+[![Junit Test](https://github.com/Tencent/spring-cloud-tencent/actions/workflows/junit.yml/badge.svg?branch=hoxton)](https://github.com/Tencent/spring-cloud-tencent/actions/workflows/junit.yml)
+[![codecov.io](https://codecov.io/gh/Tencent/spring-cloud-tencent/branch/hoxton/graph/badge.svg)](https://codecov.io/gh/Tencent/spring-cloud-tencent?branch=hoxton)
 
 English | [简体中文](./README-zh.md)