[whatwg/fetch] Meta: update repository files (#1015)

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/fetch/pull/1015

-- Commit Summary --

  * Meta: update repository files

-- File Changes --

    M .gitignore (2)
    M Makefile (3)
    A PULL_REQUEST_TEMPLATE.md (15)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1015.patch
https://github.com/whatwg/fetch/pull/1015.diff

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