Update Build Status badge: Travis -> GH Actions

Author: SergeAstapov

README.md

@@ -1,6 +1,6 @@
 # ember-try
 
-[![npm version](https://badge.fury.io/js/ember-try.svg)](https://badge.fury.io/js/ember-try) [![Build Status](https://travis-ci.org/ember-cli/ember-try.svg?branch=master)](https://travis-ci.org/ember-cli/ember-try) [![Ember Observer Score](http://emberobserver.com/badges/ember-try.svg)](http://emberobserver.com/addons/ember-try) [![Build status](https://ci.appveyor.com/api/projects/status/9sswkni8pfuvo4dv/branch/master?svg=true)](https://ci.appveyor.com/project/kategengler/ember-try/branch/master) [![Code Climate](https://codeclimate.com/github/ember-cli/ember-try/badges/gpa.svg)](https://codeclimate.com/github/ember-cli/ember-try) [![Test Coverage](https://codecov.io/gh/ember-cli/ember-try/branch/master/graph/badge.svg)](https://codecov.io/gh/ember-cli/ember-try)
+[![npm version](https://badge.fury.io/js/ember-try.svg)](https://badge.fury.io/js/ember-try) [![GitHub Actions Build Status](https://github.com/ember-cli/ember-try/workflows/CI/badge.svg)](https://github.com/ember-cli/ember-try/actions/workflows/ci.yml?query=branch%3Amaster) [![Ember Observer Score](http://emberobserver.com/badges/ember-try.svg)](http://emberobserver.com/addons/ember-try) [![Build status](https://ci.appveyor.com/api/projects/status/9sswkni8pfuvo4dv/branch/master?svg=true)](https://ci.appveyor.com/project/kategengler/ember-try/branch/master) [![Code Climate](https://codeclimate.com/github/ember-cli/ember-try/badges/gpa.svg)](https://codeclimate.com/github/ember-cli/ember-try) [![Test Coverage](https://codecov.io/gh/ember-cli/ember-try/branch/master/graph/badge.svg)](https://codecov.io/gh/ember-cli/ember-try)
 
 An ember-cli addon to test against multiple dependencies, such as `ember` and `ember-data`.