[imsc] Add IMSC 1.2 and 1.3 to README (#591)

palemieux has just created a new issue for https://github.com/w3c/imsc:

== Add IMSC 1.2 and 1.3 to README ==
None

Please view or discuss this issue at https://github.com/w3c/imsc/issues/591 using your GitHub account


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Received on Friday, 17 January 2025 17:32:38 UTC