Update README badge

Author: xuwei-k

README.md

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-sbt-gitbucket-plugin [![build](https://github.com/gitbucket/sbt-gitbucket-plugin/workflows/build/badge.svg?branch=master)](https://github.com/gitbucket/sbt-gitbucket-plugin/actions?query=workflow%3Abuild+branch%3Amaster) [![Maven Central](https://maven-badges.herokuapp.com/maven-central/io.github.gitbucket/sbt-gitbucket-plugin/badge.svg)](https://maven-badges.herokuapp.com/maven-central/io.github.gitbucket/sbt-gitbucket-plugin) [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://github.com/gitbucket/gitbucket/blob/master/LICENSE)
+sbt-gitbucket-plugin [![build](https://github.com/gitbucket/sbt-gitbucket-plugin/actions/workflows/build.yml/badge.svg?branch=master&event=push)](https://github.com/gitbucket/sbt-gitbucket-plugin/actions/workflows/build.yml) [![Maven Central](https://maven-badges.herokuapp.com/maven-central/io.github.gitbucket/sbt-gitbucket-plugin/badge.svg)](https://maven-badges.herokuapp.com/maven-central/io.github.gitbucket/sbt-gitbucket-plugin) [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://github.com/gitbucket/gitbucket/blob/master/LICENSE)
 ========
 
 This sbt plugin supports GitBucket plugin development.