Option to disable or clear cache

[dorshinar]

Hi :)
First of all I wanted to say that import cost is a very cool tool to use when working with external libraries!

Lately I was working on a library at work and wanted to make sure that tree-shaking was working correctly so I used import-cost to get a good sense if I'm in the right direction or not.
It went really well, but I do have a small request - to have the option to disable or clear the cache manually. I couldn't find anything in the docs about it, but it would make my life easier.

My trick to overcome this was to continually change the package.json#version to random numbers to trigger recalculations, but I'd love a built-in way to achieve that as well.

Thank you!