lib/plugins/aws/customResources/resources/s3/lib/permissions.js/removePermission
function removePermission(config) {
  const { functionName, bucketName, region } = config;
  const lambda = new AWS.Lambda({ region });
  const payload = {
    FunctionName: functionName,
    StatementId: getStatementId(functionName, bucketName),
  };
  return lambda.removePermission(payload).promise();
}