fix: CreateOptions.transform should return stream

[toyobayashi]

According to lib/filesystem.js#L65-L80

const transformed = options.transform && options.transform(p)
if (transformed) {
  const tmpdir = await fs.mkdtemp(path.join(os.tmpdir(), 'asar-'))
  const tmpfile = path.join(tmpdir, path.basename(p))
  const out = fs.createWriteStream(tmpfile)
  const readStream = fs.createReadStream(p)

  await pipeline(readStream, transformed, out)
  file.transformed = {
    path: tmpfile,
    stat: await fs.lstat(tmpfile)
  }
  size = file.transformed.stat.size
} else {
  size = file.stat.size
}

[malept]

Thanks, good catch.

[malept]

For some reason CI isn't working on this PR.

[toyobayashi]

anything i can help?

[electron-bot]

🎉 This PR is included in version 3.0.3 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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