wrapper

type Config struct {
	Path     string `yaml:"path"`
	FileName string `yaml:"file-name"`
	Level    string `yaml:"level"`
	Rotate   struct {
		Size           string `yaml:"size"`
		BackupLimit    int    `yaml:"backup-limit"`
		BackupExpire   int    `yaml:"backup-expire"` // unit: day
		BackupCompress bool   `yaml:"backup-compress"`
	} `yaml:"rotate"`
	Stdout bool `yaml:"stdout"`
}