code: async function downloadSubtitles (file) {
    const subtitles = await getSubtitles(file)
  
    const { dir, name } = path.parse(file)
  
    const subtitlesFile = path.format({ dir, name, ext: '.srt' })
  
    await fs.writeFile(subtitlesFile, subtitles)
  
    return subtitlesFile
  }
docs: Download subtitles for the given file and create a '.srt' file next to it,
  with the same name.
  
  @param {string} file - path to a file
  @returns {Promise<string>} path to the .srt file