Improving the CI/CD pipeline

In Chapter 6, Testing and Continuous Integration, when we created the Jenkinsfile using the CI/CD sub-generator, we commented out the deployment stage. Re-enable it and check whether the application is deployed to Heroku when you make new commits:

• See if you can add e2e tests to the pipeline. 
• If your application is on GitHub, try to add Travis to the project using the ci-cd sub-generator.