What problem does this solve?

We have currently run into an issue where 30% of our binary size is the urfave/cli library. With the latest release v2 it it 50%, which for us is not going to fly.

• Add a minimal version of the cli, using conditional compilation maybe?

Solution description

Add a minimal build flag which does not include all the external dependencies like md2man etc, and simply contains the 'core' functionality of the library.