[w3c/webpayments-payment-apps-api] Modify section 10.4 Payment App Response to allow an app to cancel. (#72)

This change designate rejection of the Promise provided to respondWith
as an acceptable way to cancel out of a payment app. How the user agent
wants to handle rejection of this Promise is left open, but allowing for
retries, or trying a different app is encouraged.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/webpayments-payment-apps-api/pull/72

-- Commit Summary --

  * Modify section 10.4 Payment App Response to allow an app to cancel.

-- File Changes --

    M index.html (40)

-- Patch Links --

https://github.com/w3c/webpayments-payment-apps-api/pull/72.patch
https://github.com/w3c/webpayments-payment-apps-api/pull/72.diff

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