[w3c/payment-request] Throw on dup shippingOptions (closes #594, ##595) (#596)

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

  https://github.com/w3c/payment-request/pull/596

-- Commit Summary --

  * Throw on dup shippingOptions (closes #594, ##595)

-- File Changes --

    M index.html (46)

-- Patch Links --

https://github.com/w3c/payment-request/pull/596.patch
https://github.com/w3c/payment-request/pull/596.diff

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