Support local files

[eliassjogreen]

It's me again. I would love support for locally built files for using deno-plugin-prepare in development but because fetch doesn't support local fetching of files it throws the following:

error: Uncaught TypeError: scheme 'file' not supported

[manyuanrong]

I don't think there is a problem supporting local files, but it doesn't seem to make much sense. This is just convenient for debugging during development。

I think what you want is this. It will be more convenient
https://github.com/manyuanrong/deno_mongo/blob/master/build.ts

[eliassjogreen]

Although that build script wouldn't work anymore now that there is multi-file support because of the checksum part of the filename. I could use the checksum for the release url but that just seems like a lot of work each time you release a new version.