add support for skipping pinned vesrions

[rbnayax]

If someone pinned a version, they might not want to update it. In that case, if using a new flag, it will be skipped

[rbnayax]

@raineorshine the prints I added mess up with the progress bar printing. Any suggestions on how to deal with it?

[raineorshine]

Hi, thanks for your submission.

This functionality is better achieved in user land, without adding to the public api.

See: filterVersion

[rbnayax]

I agree that it can be achieved by that, and we are already using it (filterResults actually) but this requires from the user to write custom code and use the js config. I believe that this feature should be easier to achieve via a flag. The filter logic should be used for more complex logic

[raineorshine]

That's reasonable, but ultimately it's not in alignment with the design philosophy of npm-check-updates. We already have a ton of options, so I'm not willing to add another option for something that can be accomplished with a custom filter function.

We also have --target semver which respects pinned versions.