[w3c/push-api] Options are...optional. (#201)

Closes #200.

@beverloo, I decided to go with MUST NOT.  That keeps things copacetic I think.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/push-api/pull/201

-- Commit Summary --

  * Options are...optional.

-- File Changes --

    M index.html (4)

-- Patch Links --

https://github.com/w3c/push-api/pull/201.patch
https://github.com/w3c/push-api/pull/201.diff

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