[ttml2] Pull Request: Update TTML1 reference (#884).

skynavga has just submitted a new pull request for https://github.com/w3c/ttml2:

== Update TTML1 reference (#884). ==
Closes #884.

See https://github.com/w3c/ttml2/pull/913

Received on Thursday, 19 July 2018 12:13:18 UTC