Update README.md

Author: pjfanning

README.md

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 # Swagger Scala Module
 
-[![Build Status](https://travis-ci.com/swagger-akka-http/swagger-scala-module.svg?branch=develop)](https://travis-ci.com/swagger-akka-http/swagger-scala-module)
+![Build Status](https://github.com/swagger-akka-http/swagger-scala-module/actions/workflows/ci.yml/badge.svg)
 [![Maven Central](https://maven-badges.herokuapp.com/maven-central/com.github.swagger-akka-http/swagger-scala-module_2.13/badge.svg?style=plastic)](https://maven-badges.herokuapp.com/maven-central/com.github.swagger-akka-http/swagger-scala-module_2.13)
 
 This is a fork of https://github.com/swagger-api/swagger-scala-module.