Use GitHub Actions for build status badge in Readme

Author: samsonjs

README.md

@@ -23,7 +23,7 @@
 Use [active_model_serializers](https://github.com/rails-api/active_model_serializers) with [Grape](https://github.com/intridea/grape)!
 
 [![Gem Version](https://badge.fury.io/rb/grape-active_model_serializers.svg)](https://badge.fury.io/rb/grape-active_model_serializers)
-[![Build Status](https://api.travis-ci.org/ruby-grape/grape-active_model_serializers.svg)](http://travis-ci.org/ruby-grape/grape-active_model_serializers) [![Code Climate](https://codeclimate.com/github/ruby-grape/grape-active_model_serializers.svg)](https://codeclimate.com/github/ruby-grape/grape-active_model_serializers)
+[![Build Status](https://github.com/ruby-grape/grape-active_model_serializers/actions/workflows/ci.yml/badge.svg)](https://github.com/ruby-grape/grape-active_model_serializers/actions/workflows/ci.yml) [![Code Climate](https://codeclimate.com/github/ruby-grape/grape-active_model_serializers.svg)](https://codeclimate.com/github/ruby-grape/grape-active_model_serializers)
 
 ## Installation