Remove link to SotM 2019 video

README.md

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 :warning: _We've recently changed our branch names. [`develop`](https://github.com/openstreetmap/iD/tree/develop) is now the default branch, replacing `2.x`. [`v3-prototype`](https://github.com/openstreetmap/iD/tree/v3-prototype) is now the alpha version of iD v3, replacing `master`. [`release`](https://github.com/openstreetmap/iD/tree/release) is still `release`._
 
-[Watch the video](https://2019.stateofthemap.us/program/sat/id-v3.html) from our talk at State of the Map US 2019 to learn more about the current status of iD and our goals for v3.
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 ## Basics