[whatwg/streams] Export the "transform stream" concept (#949)

The encoding standard needs to refer to the "transform stream" concept.
Export it.


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<a href="https://whatpr.org/streams/949.html" title="Last updated on Aug 3, 2018, 1:46 PM GMT (a282ebe)">Preview</a> | <a href="https://whatpr.org/streams/949/f2aa279...a282ebe.html" title="Last updated on Aug 3, 2018, 1:46 PM GMT (a282ebe)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/949

-- Commit Summary --

  * Export the "transform stream" concept

-- File Changes --

    M index.bs (2)

-- Patch Links --

https://github.com/whatwg/streams/pull/949.patch
https://github.com/whatwg/streams/pull/949.diff

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