feat: support --version

[Barbapapazes]

🔗 Linked issue

fix #66

❓ 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

This PR adds, as same as -h / --help option, -v / --version option to show the version, if defined, of the CLI.

📝 Checklist

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

[pi0]

Thanks for this PR i often needed it as well!

I have made few refactors to keep it simple with only --version support when no other args are provided to reduce chances of conflict with user args (such as -v for --verbose). We can improve this later.

[SrBrahma]

I think it should support -v out of the box. It's much more probable to have -v for version than for --verbose. If the user don't want -v, the user should be able to redefine the version command where this alias isn't defined or is something else.

[SrBrahma]

Even better, if a command with alias h or v is defined, it overwrites the alias for help and version. I think it would be the best of all worlds.

I can happily make a PR for that. I like this lib, and it's very similar to a solution I did for myself some time ago.

[pi0]

@SrBrahma can you please open an issue to keep track of this? Auto disable sounds nice idea (BTW, it is not that easy, we need to also scan all sub-commands if they support -v flag for custom behavior or not but seems worth to track)