[w3c/webpayments-methods-card] Update spec to use 4-digit expirations (#22)

Both Chrome and Edge’s implementations use 4-digit years, so updating
spec to reflect reality.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/webpayments-methods-card/pull/22

-- Commit Summary --

  * Update spec to use 4-digit expirations

-- File Changes --

    M index.html (4)

-- Patch Links --

https://github.com/w3c/webpayments-methods-card/pull/22.patch
https://github.com/w3c/webpayments-methods-card/pull/22.diff

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https://github.com/w3c/webpayments-methods-card/pull/22