The following example `serverless.yml` fails to deploy on localstack:

```yaml
service: "localtest"

provider:
  name: "aws"
  runtime: "nodejs10.x"

functions:
  hello:
    handler: "handler.hello"
    
resources:
  Resources:
    ApiGatewayRestApi:
      Type: "AWS::ApiGateway::RestApi"
      Properties:
        Name: "${self:provider.stage}-${self:service}"
    GatewayResponseDefault400:
      Type: "AWS::ApiGateway::GatewayResponse"
      Properties:
        RestApiId:
          Ref: "ApiGatewayRestApi"
        ResponseType: "DEFAULT_4XX"
        ResponseTemplates:
          application/json: '{"errors":[{"message":"Custom text."}]}'
    GatewayResponseUnauthorized:
      Type: "AWS::ApiGateway::GatewayResponse"
      Properties:
        RestApiId:
          Ref: "ApiGatewayRestApi"
        ResponseType: "UNAUTHORIZED"
        ResponseTemplates:
          application/json: '{"errors":[{"message":"Custom text!", "extra":"Some extra info"}]}'
    GatewayResponseDefault500:
      Type: "AWS::ApiGateway::GatewayResponse"
      Properties:
        RestApiId:
          Ref: "ApiGatewayRestApi"
        ResponseType: "DEFAULT_5XX"
        ResponseTemplates:
          application/json: '{"errors":[{"message":$context.error.messageString}]}'
    GatewayResponseIntegrationTimeout:
      Type: "AWS::ApiGateway::GatewayResponse"
      Properties:
        RestApiId:
          Ref: "ApiGatewayRestApi"
        ResponseType: "INTEGRATION_TIMEOUT"
        ResponseTemplates:
          application/json: '{"errors":[{"message":$context.error.messageString}]}'

plugins:
- "serverless-localstack"

custom:
  localstack:
    stages:
      - "local"
```

The error on the localstack end is `Exception: CloudFormation deployment for resource type ApiGateway::GatewayResponse not yet implemented`.
if resource:
                    return resource
        
        resource_json_arns_fixed = clone(json_safe(convert_objs_to_ids(resource_json)))
        set_moto_account_ids(resource_json_arns_fixed)
        
        if resource or update:
            parse_and_update_resource_orig(logical_id,
                resource_json_arns_fixed, resources_map, region_name)
        elif not resource:
            resource = parse_and_create_resource_orig(logical_id,
                resource_json_arns_fixed, resources_map, region_name)
        
        if hasattr(resource, 'region_name') and resource.region_name != region_name:
            LOG.debug('Updating incorrect region from %s to %s' % (resource.region_name, region_name))
            resource.region_name = region_name
        
        update_resource_name(resource, resource_json)
        LOG.debug('Deploying CloudFormation resource (update=%s): %s' % (update, resource_json))
        try:
            CURRENTLY_UPDATING_RESOURCES[resource_hash_key] = True
            deploy_func = template_deployer.update_resource if update else template_deployer.deploy_resource
            result = deploy_func(logical_id, resource_wrapped, stack_name=stack_name)
        finally:
            CURRENTLY_UPDATING_RESOURCES[resource_hash_key] = False
        if not should_be_created:
            
            return resource
        def find_id(resource):