[media-and-entertainment] Merged Pull Request: Reflect change of Chair in charter

chrisn has just merged tidoust's pull request 67 for https://github.com/w3c/media-and-entertainment:

== Reflect change of Chair in charter ==
This adjusts the list of Chairs, and aligns the charter with the version sent to the AC for review.

See https://github.com/w3c/media-and-entertainment/pull/67


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