[w3c/webpayments-payment-handler] Update README.md to link to new repo (#135)

Change link to new repo webpayments-payment-handler
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/webpayments-payment-handler/pull/135

-- Commit Summary --

  * Update README.md

-- File Changes --

    M README.md (2)

-- Patch Links --

https://github.com/w3c/webpayments-payment-handler/pull/135.patch
https://github.com/w3c/webpayments-payment-handler/pull/135.diff

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