[w3c/browser-payment-api] Make updateWith() return a promise signaling any update failures (#418)

This closes #350. It is a slightly backward-incompatible change in that consumers which were previously try-catching errors will no longer see them. But consumers that were always passing valid data, or passing invalid data and not try-catching the errors, will see no changes.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/browser-payment-api/pull/418

-- Commit Summary --

  * Make updateWith() return a promise signaling any update failures

-- File Changes --

    M index.html (151)

-- Patch Links --

https://github.com/w3c/browser-payment-api/pull/418.patch
https://github.com/w3c/browser-payment-api/pull/418.diff

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