[mediacapture-region] new commits pushed by eladalon1983

The following commits were just pushed by eladalon1983 to https://github.com/w3c/mediacapture-region:

* Update demo
  by François Beaufort
https://github.com/w3c/mediacapture-region/commit/2f54b2c7c29df1d6ab8307fd0c17e06798d67d3e

* Merge pull request #66 from beaufortfrancois/fix-demo

Update demo
  by Elad Alon
https://github.com/w3c/mediacapture-region/commit/b3cd0a660eee2a34de9c118923ee544518e1ed7e



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