new read methods

new blobs already have a promise api - it should be recommended/mention that it's now possible to do
- `await blob.text()`
- `await blob.arrayBuffer()`
- `blob.stream()`
- `await new Response(blob).json()`
- `img.src = URL.createObjectURL(blob)` cuz you don't need base64 dataUrl

and using the filereader is discouraged since NodeJS have `buffer.Blob` but no FileReader for example.