Deprecate?

[jimmywarting]

... in favor of spec compatible FormData implementations.

There are at least 2 other FormData multipart pkg on npm

• My own: formdata-polyfill
• And: formdata-node + form-data-encoder

Both of which supports appending Blob + File like items. So calculating content-length without reading a stream or anything like that is in a since better.
Both also runs some WPT tests to be spec compatible with generating correct filenames and stuff
and has all the methods that are needed.

[perry-mitchell]

@jimmywarting It looks like your formdata-polyfill doesn't support streams as values in multi-part sections, whereas this library does. Any plans on adding this? Imo without it this library is still very relevant.

The formdata-node implementation of stream handling is verbose and honestly a PITA compared to this library.