[whatwg/xhr] Add note about event listeners causing preflight (#148)

You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/xhr/pull/148

-- Commit Summary --

  * Add note about event listeners causing preflight

-- File Changes --

    M xhr.bs (6)

-- Patch Links --

https://github.com/whatwg/xhr/pull/148.patch
https://github.com/whatwg/xhr/pull/148.diff

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