[w3c/browser-payment-api] BREAKING CHANGE: change `supportedMethods` to DOMString (#551)

Closes #549.

Changes `supportedMethods` from a sequence to single DOMString.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/browser-payment-api/pull/551

-- Commit Summary --

  * BREAKING CHANGE: change `supportedMethods` to DOMString

-- File Changes --

    M index.html (42)

-- Patch Links --

https://github.com/w3c/browser-payment-api/pull/551.patch
https://github.com/w3c/browser-payment-api/pull/551.diff

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