[w3c/payment-request] Validate PMIs, ignore duplicates (#581)

* Validate supportedMethods (closes #464)
* Defines behavior for duplicate PMIs in contructor and updateWith() (closes #309)
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-request/pull/581

-- Commit Summary --

  * Validate PMIs, ignore duplicates

-- File Changes --

    M index.html (51)

-- Patch Links --

https://github.com/w3c/payment-request/pull/581.patch
https://github.com/w3c/payment-request/pull/581.diff

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