Can we get a --version, -V? Willing to patch.

[coolaj86]

I've got script that relies on this and I'd like to have it print out the version at the beginning as this also gives a good opportunity for the install prompt.

# causes install prompt if not already installed, then shows version
npx -p [email protected] -- ts-to-jsdoc --version

Here's roughly how I would add it:

let pkg = require('./package.json');

function showVersion() {
  console.info(`${pkg.name} v${pkg.version}`);
}

let versionFlags = [`--version`, `-V`, `version`];
for (let flag of versionFlags) {
  let wantsVersion = process.argv.includes(flag)
  if (wantsVersion) {
    showVersion();
    process.exit(0);
    return;
  }
}