fix(withProtocol): consider relative protocol - #242

🔗 Linked issue

Resolve: #241

❓ Type of change

• 📖 Documentation (updates to the documentation, readme, or JSdoc annotations)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Add protocol relative behaviour

Reference links on relative protocol

• https://stackoverflow.com/a/9646435
• https://stackoverflow.com/questions/550038/is-it-valid-to-replace-http-with-in-a-script-src-http
• https://stackoverflow.com/a/960111

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.