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: #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 #140, as well as chain of commits if an more understandable git history is desired.