[browser-payment-api] Add reference to issue #49. (#83)

Add reference to issue #49.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/browser-payment-api/pull/83

-- Commit Summary --

  * Remove trailing whitespace.
  * Add reference to issue #49.

-- File Changes --

    M specs/paymentrequest.html (86)

-- Patch Links --

https://github.com/w3c/browser-payment-api/pull/83.patch
https://github.com/w3c/browser-payment-api/pull/83.diff

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