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`.
pass
    def cleanup(self, arn=None):
        pass
    def _store_logs(self, func_details, log_output, invocation_time):
        if not aws_stack.is_service_enabled('logs'):
            return
        logs_client = aws_stack.connect_to_service('logs')
        log_group_name = '/aws/lambda/%s' % func_details.name()
        time_str = time.strftime('%Y/%m/%d', time.gmtime(invocation_time))
        log_stream_name = '%s/[$LATEST]%s' % (time_str, short_uid())
        
        log_groups = logs_client.describe_log_groups()['logGroups']
        log_groups = [lg['logGroupName'] for lg in log_groups]
        if log_group_name not in log_groups:
            try:
                logs_client.create_log_group(logGroupName=log_group_name)
            except botocore.errorfactory.ResourceAlreadyExistsException:
                
                pass
        
        logs_client.create_log_stream(logGroupName=log_group_name, logStreamName=log_stream_name)
        
        invocation_time = invocation_time
        finish_time = int(time.time() * 1000)
        log_lines = log_output.split('\n')
        time_diff_per_line = float(finish_time - invocation_time) / float(len(log_lines))
        log_events = []
        for i, line in enumerate(log_lines):
            if not line: