Add suggestion on how to resolve spotted issues

As an example, when the biggest blob is found, git-sizer could suggest how to remove it. There is a tool out there named git-forget-blob which could be used to solve the issue if the blob is to be found to be a mistake.

For example in our case, someone had committed/pushed a cscope.out in their own branch.

When there are possible solution like this, providing a "suggestion" on how to proceed next, would be awesome.