[mediacapture-screen-share] Pull Request: Move some people to editors emeritus

martinthomson has just submitted a new pull request for https://github.com/w3c/mediacapture-screen-share:

== Move some people to editors emeritus ==
I'm not following closely enough any more and I'm certain that these others are not.

See https://github.com/w3c/mediacapture-screen-share/pull/251


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