Fix version option and review documentation

[fmulero]

Signed-off-by: Fran Mulero fmulero@vmware.com

Description of the change

Fix version option and review documentation, package.json and add .npmrc before publishing in https://www.npmjs.com/

Benefits

Now readme-generator --version shows current version instead of undefined

Possible drawbacks

None

Additional information

Checklist

• [X] Version bumped in package.json and package-lock.json according to semver.
• [X] All tests pass running npm test