message: dynamic lambda permission based on skill id
diff: @@ -80,8 +80,7 @@ export class TheAlexaSkillStack extends cdk.Stack {
  //Allow the Alexa service to invoke the fulfillment Lambda
  alexaLambda.addPermission('AlexaPermission', {
  - // TODO find out how to dynamically get this value
  - //eventSourceToken: skill.skillId,
  + eventSourceToken: skill.ref,
  principal: new ServicePrincipal('alexa-appkit.amazon.com'),
  action: 'lambda:InvokeFunction'
  });
  