[w3c/webpayments] Add link to issue 19 (#197)

You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/webpayments/pull/197

-- Commit Summary --

  * Merge remote-tracking branch 'w3c/gh-pages' into gh-pages

-- File Changes --


-- Patch Links --

https://github.com/w3c/webpayments/pull/197.patch
https://github.com/w3c/webpayments/pull/197.diff

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