[w3c/browser-payment-api] Add error message that can be provided as part of updateWith (#257)

We have had lots of feedback that merchants need to explain errors to customers during the payment request. For example, if a shipping address is not acceptable then the site must be able to indicate why.

This change adds an `error` string to the `PaymentDetails`, which may only be used as part of `updateWith`.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/browser-payment-api/pull/257

-- Commit Summary --

  * Add error message that can be provided as part of updateWith

-- File Changes --

    M index.html (18)

-- Patch Links --

https://github.com/w3c/browser-payment-api/pull/257.patch
https://github.com/w3c/browser-payment-api/pull/257.diff

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