build: fix repository.url in package.json

[dsanders11]

Clears this warning during publish:

npm warn publish npm auto-corrected some errors in your package.json when publishing.  Please run "npm pkg fix" to address these errors.
npm warn publish errors corrected:
npm warn publish "repository.url" was normalized to "git+https://github.com/electron/universal.git"

[continuous-auth]

🎉 This PR is included in version 2.0.2 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀