[w3c/payment-request] Remove PaymentAddress' regionCode attribute (#823)

(... IN CASE WE DECIDE TO DROP IT FOR V1 ... Blocked on #816)

closes #816 

The following tasks have been completed:

 * [X] Confirmed there are no ReSpec errors/warnings.
 * [ ] Modified Web platform tests (link)
 * [ ] Modified MDN Docs (link)
 * [ ] Has undergone security/privacy review (link)
 
Implementation commitment:

 * [ ] Safari (link to issue)
 * [ ] Chrome (link to issue)
 * [ ] Firefox (link to issue)
 * [ ] Edge (public signal)

Optional, impact on Payment Handler spec?


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<a href="https://pr-preview.s3.amazonaws.com/w3c/payment-request/pull/823.html" title="Last updated on Jan 15, 2019, 5:28 AM UTC (4cf95df)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/payment-request/823/a1e773a...4cf95df.html" title="Last updated on Jan 15, 2019, 5:28 AM UTC (4cf95df)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-request/pull/823

-- Commit Summary --

  * Remove PaymentAddress' regionCode attribute

-- File Changes --

    M index.html (137)

-- Patch Links --

https://github.com/w3c/payment-request/pull/823.patch
https://github.com/w3c/payment-request/pull/823.diff

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https://github.com/w3c/payment-request/pull/823