[heycam/webidl] Add async_iterable support (#720)

Fixes #580.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/720

-- Commit Summary --

  * Add async_iterable support

-- File Changes --

    M index.bs (408)

-- Patch Links --

https://github.com/heycam/webidl/pull/720.patch
https://github.com/heycam/webidl/pull/720.diff

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https://github.com/heycam/webidl/pull/720