levels.go
func (level Level) String() string {
	switch level {
	case EMERGENCY:
		return "EMERGENCY"
	case ALERT:
		return "ALERT"
	case CRITICAL:
		return "CRITICAL"
	case ERROR:
		return "ERROR"
	case WARNING:
		return "WARNING"
	case NOTICE:
		return "NOTICE"
	case INFO:
		return "INFO"
	default:
		return "DEBUG"
	}
}
func (level Level) String() string {
	switch level {
	case EMERGENCY:
		return "EMERGENCY"
	case ALERT:
		return "ALERT"
	case CRITICAL:
		return "CRITICAL"
	case ERROR:
		return "ERROR"
	case WARNING:
		return "WARNING"
	case NOTICE:
		return "NOTICE"
	case INFO:
		return "INFO"
	default:
		return "DEBUG"
	}
}
// String returns stirng representation of log level.