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`.
return result[0] if result else None
        elif resource_type == 'ApiGateway::Resource':
            api_id = resource_props['RestApiId'] if resource else resource_id
            api_id = resolve_refs_recursively(stack_name, api_id, resources)
            parent_id = resolve_refs_recursively(stack_name, resource_props['ParentId'], resources)
            if not api_id or not parent_id:
                return None
            api_resources = aws_stack.connect_to_service('apigateway').get_resources(restApiId=api_id)['items']
            target_resource = list(filter(lambda res:
                res.get('parentId') == parent_id and res['pathPart'] == resource_props['PathPart'], api_resources))
            if not target_resource:
                return None
            path = aws_stack.get_apigateway_path_for_resource(api_id,
                target_resource[0]['id'], resources=api_resources)
            result = list(filter(lambda res: res['path'] == path, api_resources))
            return result[0] if result else None
        elif resource_type == 'ApiGateway::Deployment':
            api_id = resource_props['RestApiId'] if resource else resource_id
            api_id = resolve_refs_recursively(stack_name, api_id, resources)
            if not api_id:
                return None
            result = aws_stack.connect_to_service('apigateway').get_deployments(restApiId=api_id)['items']
            
            return result[0] if result else None
        elif resource_type == 'ApiGateway::Method':
            api_id = resolve_refs_recursively(stack_name, resource_props['RestApiId'], resources)
            res_id = resolve_refs_recursively(stack_name, resource_props['ResourceId'], resources)
            if not api_id or not res_id:
                return None
            res_obj = aws_stack.connect_to_service('apigateway').get_resource(restApiId=api_id, resourceId=res_id)