Whitelist files to include when publishing

[MrChocolatine]

Build

Whitelist files to include when publishing (#158)

To reduce the final bundle size.

Before

➜ npm publish --dry-run

npm notice === Tarball Contents ===
npm notice 22B   .github/CODEOWNERS
npm notice 87B   config/environment.js
npm notice 527B  addon/index.js
npm notice 98B   app/index.js
npm notice 70B   index.js
npm notice 268B  addon/helpers/remove-diacritics.js
npm notice 66B   app/helpers/remove-diacritics.js
npm notice 221B  addon/helpers/slugify.js
npm notice 56B   app/helpers/slugify.js
npm notice 2.8kB package.json
npm notice 1.1kB LICENSE.md
npm notice 3.3kB README.md
npm notice 313B  .github/workflows/ci.yml
npm notice 375B  .github/workflows/contributors.yml
npm notice 691B  .github/dependabot.yml
npm notice 547B  .github/workflows/tag-release-publish.yml
npm notice === Tarball Details ===
npm notice name:          ember-slugify
npm notice version:       2.0.0
npm notice package size:  4.4 kB
npm notice unpacked size: 10.6 kB
npm notice total files:   16

After

➜ npm publish --dry-run

npm notice === Tarball Contents ===
npm notice 87B   config/environment.js
npm notice 527B  addon/index.js
npm notice 98B   app/index.js
npm notice 70B   index.js
npm notice 268B  addon/helpers/remove-diacritics.js
npm notice 66B   app/helpers/remove-diacritics.js
npm notice 221B  addon/helpers/slugify.js
npm notice 56B   app/helpers/slugify.js
npm notice 2.9kB package.json
npm notice 1.1kB LICENSE.md
npm notice 3.3kB README.md
npm notice === Tarball Details ===
npm notice name:          ember-slugify
npm notice version:       2.0.0
npm notice package size:  3.5 kB
npm notice unpacked size: 8.7 kB
npm notice total files:   11