message: updated stack to include the saveCustomer mutation
diff: @@ -66,6 +66,16 @@ export class TheSimpleGraphQLServiceStack extends cdk.Stack {
  });
  // Mutation Resolver for updating an exisiting Customer
  + customerDS.createResolver({
  + typeName: 'Mutation',
  + fieldName: 'saveCustomer',
  + requestMappingTemplate: MappingTemplate.dynamoDbPutItem(
  + PrimaryKey.partition('id').is('id'),
  + Values.projecting('customer')),
  + responseMappingTemplate: MappingTemplate.dynamoDbResultItem(),
  + });
  +
  + // Mutation resolver for creating a new customer along with their first order
  customerDS.createResolver({
  typeName: 'Mutation',
  fieldName: 'saveCustomerWithFirstOrder',
  