Asar support breaks on asar archives where JSON header size >= 240

[timojaask]

The support for asar works only on asar archives where JSON header size is less than 240 bytes.

I'm not sure why this limitation was added in the original PR #378. It looks like the exact logic came from this PR https://github.com/dyoshikawa/file-type/pull/1/files.

@Borewit do you remember if there was a reason why did you limit it to 240?
if (jsonSize > 12 && jsonSize < 240 && buffer.length >= jsonSize + 16) {

You can easily break this by creating an asar archive that contains just a few more files and makes the JSON longer than 240 bytes.

[Borewit]

@Borewit do you remember if there was a reason why did you limit it to 240?

Sorry, I don't remember.

[Borewit]

I could not find any reason for the 240 header length limit, therefor I will remove it. Thanks for bringing this to our attention @timojaask.