[streams] Add readableAmount getter to ReadableByteStream (#279)

You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/279

-- Commit Summary --

  * Add readableAmount getter to ReadableByteStream

-- File Changes --

    M BinaryExtension.md (7)

-- Patch Links --

https://github.com/whatwg/streams/pull/279.patch
https://github.com/whatwg/streams/pull/279.diff

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https://github.com/whatwg/streams/pull/279