Update README.md

Author: puneetbehl

README.md

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 # Grails AngularJS Scaffolding Plugin
 
-[![Build Status](https://travis-ci.org/grails-plugins/grails-angular-scaffolding.svg?branch=master)](https://travis-ci.org/grails-plugins/grails-angular-scaffolding)
+[![Java CI](https://github.com/grails/grails-angularjs-scaffolding/actions/workflows/gradle.yml/badge.svg)](https://github.com/grails/grails-angularjs-scaffolding/actions/workflows/gradle.yml)
 
 A plugin for generating client side assets based on domain classes