chore: remove HISTORY.md and nonexistent CONTRIBUTING.md from tarball

[Phillip9587]

This PR removes HISTORY.md and the nonexistent 'CONTRIBUTING.md from published tarball content. It also removes automatically included files (LICENSE and README.md) from the files array.

Before:

npm pack --dry-run
npm notice
npm notice 📦  cors@2.8.5
npm notice Tarball Contents
npm notice 1.2kB HISTORY.md
npm notice 1.1kB LICENSE
npm notice 11.3kB README.md
npm notice 6.6kB lib/index.js
npm notice 999B package.json
npm notice Tarball Details
npm notice name: cors
npm notice version: 2.8.5
npm notice filename: cors-2.8.5.tgz
npm notice package size: 6.9 kB
npm notice unpacked size: 21.2 kB
npm notice shasum: 390aeb3843bc97fc0400a28c4c6e03af39f77050
npm notice integrity: sha512-0JT+RlYafxWNC[...]7O+zNNapUZRNA==
npm notice total files: 5

After:

npm pack --dry-run
npm notice
npm notice 📦  cors@2.8.5
npm notice Tarball Contents
npm notice 1.1kB LICENSE
npm notice 11.3kB README.md
npm notice 6.6kB lib/index.js
npm notice 926B package.json
npm notice Tarball Details
npm notice name: cors
npm notice version: 2.8.5
npm notice filename: cors-2.8.5.tgz
npm notice package size: 6.5 kB
npm notice unpacked size: 20.0 kB
npm notice shasum: 5a2c53a7f534cd52cb0a150c2d6fcec8a1192fd3
npm notice integrity: sha512-51Iz5vNJNv3pb[...]G7UUw/lIq8O0w==
npm notice total files: 4