[whatwg/xhr] Meta: default branch rename (#307)

Helps with https://github.com/whatwg/meta/issues/174.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/xhr/pull/307

-- Commit Summary --

  * Meta: default branch rename

-- File Changes --

    M CONTRIBUTING.md (2)
    M PULL_REQUEST_TEMPLATE.md (2)
    M README.md (6)

-- Patch Links --

https://github.com/whatwg/xhr/pull/307.patch
https://github.com/whatwg/xhr/pull/307.diff

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