Update README.md

Author: puneetbehl

README.md

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 # Embedded MongoDB Grails Plugin
 
-[![Build Status](https://travis-ci.org/grails-plugins/grails-embedded-mongodb.svg?branch=master)](https://travis-ci.org/grails-plugins/grails-embedded-mongodb)
+[![Java CI](https://github.com/grails/grails-embedded-mongodb/actions/workflows/gradle.yml/badge.svg)](https://github.com/grails/grails-embedded-mongodb/actions/workflows/gradle.yml)
 
 A plugin for running integration tests against an embedded mongo database using [Flapdoodle Embedded Mongo](https://github.com/flapdoodle-oss/de.flapdoodle.embed.mongo).