nixpkgs/.github/PULL_REQUEST_TEMPLATE.md

Things done

• Tested using sandboxing (nix-build --option build-use-sandbox true or nix.useSandbox on NixOS)
• Built on platform(s)
  • NixOS
  • OS X
  • Linux
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Fits CONTRIBUTING.md.

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