formidable vs muddler
Hey, great package I got it working pretty quick!

One use case I think was missed is stream files directly to [S3 Buckets](https://aws.amazon.com/s3/) without ever writing to the disk. 

I've noticed it uses  `formidable` which saves it to the **disk** without an option to hold it in **memory** but on the [@danielbuechele](https://github.com/danielbuechele)’s [Medium article](https://medium.com/@danielbuechele/file-uploads-with-graphql-and-apollo-5502bbf3941e) he uses [multer](https://github.com/expressjs/multer#api) which has options for saving to the `DiskStorage` or `MemoryStorage`, was there a reason to choose `formidable` over `multer` as I see a big lost in flexibility? 