[heycam/webidl] Use %PromiseProto_then% to 'perform some steps once a promise is settled'. (#611)

Fixes #583.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/611

-- Commit Summary --

  * Use %PromiseProto_then% to 'perform some steps once a promise is settled'.

-- File Changes --

    M index.bs (5)

-- Patch Links --

https://github.com/heycam/webidl/pull/611.patch
https://github.com/heycam/webidl/pull/611.diff

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https://github.com/heycam/webidl/pull/611