code: public function createDir($path)
      {
          $path = rtrim($path, '/') . '/';
          $req = new Rest($this->config);
          $res = $req->request('POST', $path)
              ->withHeader('folder', 'true')
              ->send();
          return $res->getStatusCode() === 200;
      }
docs: 创建目录
  
  @param string $path 需要在又拍云存储创建的目录路径
  
  @return bool 创建成功返回 true，否则返回 false
  @throws \Exception