switch iso8601 references to iso8601-1

w3c / pub-manifest

W3C Publication Manifest

https://w3c.github.io/pub-manifest

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Closed mattgarrish closed 4 years ago

mattgarrish commented 4 years ago

This PR updates the references to ISO 8601 for duration values to the new Part 1 version of the standard released last year.

Fixes https://github.com/w3c/audiobooks/issues/65 originally raised in the Audiobooks tracker.