fix the build badge on the README.md (#22)

Author: wakingrufus

README.md

@@ -1,7 +1,7 @@
 # Nebula Nothing Plugin
 
 ![Support Status](https://img.shields.io/badge/nebula-active-green.svg)
-![Build](https://github.com/nebula-plugins/gradle-nothing-plugin/actions/workflows/nebula.yml/badge.svg)
+![Build](https://github.com/nebula-plugins/gradle-nothing-plugin/actions/workflows/build.yml/badge.svg)
 [![Apache 2.0](https://img.shields.io/github/license/nebula-plugins/gradle-nothing-plugin.svg)](http://www.apache.org/licenses/LICENSE-2.0)
 
 ### Plugin