[push-api] Adding typedef for JSON matching the fetch spec. (#158)

Fixes #133 
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/push-api/pull/158

-- Commit Summary --

  * Adding typedef for JSON matching the fetch spec.

-- File Changes --

    M index.html (14)

-- Patch Links --

https://github.com/w3c/push-api/pull/158.patch
https://github.com/w3c/push-api/pull/158.diff

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https://github.com/w3c/push-api/pull/158