[browser-payment-api] Add a reference to issue #55. (#87)

Add a reference to issue #55.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/browser-payment-api/pull/87

-- Commit Summary --

  * Remove trailing whitespace.
  * Add reference to issue #55.

-- File Changes --

    M specs/paymentrequest.html (83)

-- Patch Links --

https://github.com/w3c/browser-payment-api/pull/87.patch
https://github.com/w3c/browser-payment-api/pull/87.diff

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