Force PR creation if the commits are made by the script

[toindev]

Use case: our scripts already make the commits like we want them (GPG signed), but if no change is detected, git-xargs will skip.

Somehow similar to: https://github.com/gruntwork-io/git-xargs/issues/39

Describe the solution you'd like a flag to force the push and PR creation

Describe alternatives you've considered Modifying the commits created by git-xargs after the fact

Additional context This allows GPG signatures, like proposed in https://github.com/gruntwork-io/git-xargs/pull/140, as well as chain of commits if an more understandable git history is desired.