chore: fix build badge

Author: yoshinorin

README.md

@@ -1,6 +1,6 @@
 # gitbucket-monitoring-plugin
 
-[![CI](https://img.shields.io/github/workflow/status/YoshinoriN/gitbucket-monitoring-plugin/CI/master?label=CI)](https://github.com/YoshinoriN/gitbucket-monitoring-plugin/actions)](https://travis-ci.org/YoshinoriN/gitbucket-monitoring-plugin) [![Codacy Badge](https://api.codacy.com/project/badge/Grade/677a69ed2e5f4137ba35986dbb02995f)](https://www.codacy.com/app/YoshinoriN/gitbucket-monitoring-plugin?utm_source=github.com&utm_medium=referral&utm_content=YoshinoriN/gitbucket-monitoring-plugin&utm_campaign=Badge_Grade)
+[![build](https://github.com/YoshinoriN/gitbucket-monitoring-plugin/workflows/build/badge.svg?branch=master)](https://github.com/YoshinoriN/gitbucket-monitoring-plugin/actions) [![Codacy Badge](https://api.codacy.com/project/badge/Grade/677a69ed2e5f4137ba35986dbb02995f)](https://www.codacy.com/app/YoshinoriN/gitbucket-monitoring-plugin?utm_source=github.com&utm_medium=referral&utm_content=YoshinoriN/gitbucket-monitoring-plugin&utm_campaign=Badge_Grade)
 
 # Features