Add CLI flag configuration

[paulshryock]

See meow or arg for basic argument parsing

[paulshryock]

This was removed in 2.0.0, but will probably be brought back in a minor version update.

[paulshryock]

--prefix/-p adds "v" prefix in 2.1.0

[paulshryock]

• prefix
• quiet
• Skip Changelog
• Skip WordPress
• Changelog path
• WordPress file paths