code: func (w *FileLogWriter) Reload() {
  	// block Logger's io.Writer
  	w.mw.Lock()
  	defer w.mw.Unlock()
  
  	// Close
  	fd := w.mw.fd
  	fd.Close()
  
  	// Open again
  	err := w.StartLogger()
  	if err != nil {
  		fmt.Fprintf(os.Stderr, "Reload StartLogger: %s\n", err)
  	}
  }
docs: // Reload file logger