Update types to allow Node.js' Buffer for uploads (#674)

* feat: Typing support for NodeJS Buffer in lib/index.d.ts

I did not test these changes on a Browser engine, but for NodeJS it should work more consistent

* Fix linting errors

Co-Authored-By: Marius Kleidl <marius@transloadit.com>

---------

Co-authored-by: Marius Kleidl <marius@transloadit.com>

lib/index.d.ts

@@ -7,9 +7,12 @@ export const defaultOptions: UploadOptions &
 
 // TODO: Consider using { read: () => Promise<{ done: boolean; value?: any; }>; } as type
 export class Upload {
-  constructor(file: File | Blob | Pick<ReadableStreamDefaultReader, 'read'>, options: UploadOptions)
+  constructor(
+    file: File | Blob | Buffer | Pick<ReadableStreamDefaultReader, 'read'>,
+    options: UploadOptions,
+  )
 
-  file: File | Blob | Pick<ReadableStreamDefaultReader, 'read'>
+  file: File | Blob | Buffer | Pick<ReadableStreamDefaultReader, 'read'>
   options: UploadOptions
   url: string | null