[w3c/payment-request] Add support for updateable (#966)

Based on discussion regarding transition request to PR, added support for "updateable"

The following tasks have been completed:

 * [✅] Confirmed there are no ReSpec errors/warnings.
 
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-request/pull/966


-- Commit Summary --

  * <a href="https://github.com/w3c/payment-request/pull/966/commits/bd4d4229daa14c420b7fefbc26a4a379f678ffda">add class=&quot;updateable-rec&quot;</a>

-- File Changes --

    M index.html (2)

-- Patch Links --

https://github.com/w3c/payment-request/pull/966.patch

https://github.com/w3c/payment-request/pull/966.diff


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