form-data-parser v0.9.0

This release updates to multipart-parser 0.10.0 and removes the restrictions on checking the size and/or sliceing FileUpload objects.

• FileUpload is now a normal subclass of File with all the same functionality (instead of just implementing the same interface)
• Add maxFiles option to parseFormData to allow limiting the number of files uploaded in a single request

let formData = await parseFormData(request, { maxFiles: 5 });
let file = formData.get('file-upload');
let size = file.size; // This is ok now!