Exclude a step from progress based on some condition

[MohmmedAshraf]

Hi there, Great package, as usual, thank you very much Spatie ❤️,
I would suggest something am working on a project that requires onboarding but based on the enabled modules,
each module has its own steps, so what I am looking for if there is an option to exclude a step from preventing the onboarding progress from being incomplete, something like this:

Onboard::addStep('Step 1')
    ...
    ->excludeIf(function (Business $business) {
        return $business->hasFeature('offers');
    });

Update
I've already contributed this feature, see #3

[RhysLees]

Should be able to do this with the following:

Onboard::addStep('Step 1')
    ...
    ->excludeIf(function ($model) {
        return $model->hasFeature('offers');
    });