add COUNT_PRIVATE for including private repo's commits in total commits

[SungminSo]

Hello! i'm grateful to you for making a useful project! I thought it would be nice to include the commit count of the private repository in total commits, so I modified that part. And it would be nice to manage GIST_ID in secrets.

[bokub]

Hi,

I think the private contributions are already counted, because you're providing a GitHub token that can already access them.

The problem with the Gist ID being in a secret is that the Github Actions are initially disabled when you fork the repo. Editing run.yml activates the action, that's why I decided to include a wrong Gist ID directly in it.