[w3c/selection-api] Change addRange (#81)

Change addRange spec to keep existing range.
Also update notes about current compatibility.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/selection-api/pull/81

-- Commit Summary --

  * Change addRange

-- File Changes --

    M index.html (30)

-- Patch Links --

https://github.com/w3c/selection-api/pull/81.patch
https://github.com/w3c/selection-api/pull/81.diff

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