title: AWS appSync issue while preparing release build
body: <p>I am using the below pods for AWS amplify services -</p>
  <pre><code>pod 'Amplify'
  pod 'AWSAppSync'
  pod 'AmplifyPlugins/AWSAPIPlugin'
  pod 'AmplifyPlugins/AWSDataStorePlugin'
  pod 'AmplifyPlugins/AWSCognitoAuthPlugin'
  pod 'AWSCognitoIdentityProvider'
  </code></pre>
  <p>It's working fine when I run the app in debug mode, but When I try to create a release build, the build is failing with the below error -</p>
  <pre><code> Instance method 'throttle(for:scheduler:latest:)' requires that 'DispatchQueue' conform to 'Scheduler'
  </code></pre>
  <p>It's inside <strong>AppSyncRealTimeClient -&gt; RealtimeConnectionProvider -&gt; subscribeToLimitExceededThrottle()</strong></p>
  <p>For more investigation, I created a new project and added the above pods. It's giving me the same errors in that newly created project as well.</p>