[whatwg/xhr] Meta: update repository files (#268)

See https://github.com/whatwg/spec-factory for details.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/xhr/pull/268

-- Commit Summary --

  * Meta: update repository files

-- File Changes --

    M .gitignore (4)
    M Makefile (3)
    A PULL_REQUEST_TEMPLATE.md (15)

-- Patch Links --

https://github.com/whatwg/xhr/pull/268.patch
https://github.com/whatwg/xhr/pull/268.diff

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