[whatwg/xhr] Update xhr.bs (#308)

"Expose ProgressEvent to ServiceWorker"

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(See [WHATWG Working Mode: Changes](https://whatwg.org/working-mode#changes) for more details.)

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

  https://github.com/whatwg/xhr/pull/308


-- Commit Summary --

  * Update xhr.bs

-- File Changes --

    M xhr.bs (2)

-- Patch Links --

https://github.com/whatwg/xhr/pull/308.patch

https://github.com/whatwg/xhr/pull/308.diff


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