title: Delete the user pool added by AWS Amplify
body: <p>I'm developing a React Native app and using AWS Amplify with Amazon Cognito for authentication. I've added the authentication for the app using Amplify CLI (<code>amplify add auth</code>). The problem is I need to add/remove the required attributes for the sign up, but those cannot be changed after the user pool is created. </p>
  
  <p>My question is how can I delete the currently added user pool using the CLI, and making sure that the changes are reflected in <code>aws-exports.js</code>?</p>