[heycam/webidl] Disallow Promise types in unions at the syntax level. (#746)

Fixes #740.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/746

-- Commit Summary --

  * Disallow Promise types in unions at the syntax level.

-- File Changes --

    M index.bs (12)

-- Patch Links --

https://github.com/heycam/webidl/pull/746.patch
https://github.com/heycam/webidl/pull/746.diff

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