[w3c/payment-request] define PaymentRequest.shippingType attribute (#568)

* closes #472 

Bonus: kills last two ReSpec warnings. 
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-request/pull/568

-- Commit Summary --

  * define PaymentRequest.shippingType attribute

-- File Changes --

    M index.html (20)

-- Patch Links --

https://github.com/w3c/payment-request/pull/568.patch
https://github.com/w3c/payment-request/pull/568.diff

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https://github.com/w3c/payment-request/pull/568