Breaking change to `github.com/arduino/go-paths-helper.Path.IsInsideDir`

[per1234]

One of the result parameters parameters was removed from the github.com/arduino/go-paths-helper.Path.IsInsideDir method in 657985f

The breaking change to the package API is reasonable, but it was not communicated to the module's users.

I suggest the following remediation measures:

• Make a 2.0.0 release (as advised here)
• Document the breaking change in the 2.0.0 release notes

[cmaglie]

We may also re-add the error result (even if it will be always nil) to fix 1.x series.

[cmaglie]

It looks like there is a lot of work to do for a v2 version: https://go.dev/blog/v2-go-modules

The suggested approach in the blog post will leave the v1 version on the git root and the v2 under the v2/... subdirectory, making the v1 version more prominent which is something I don't like.

IMHO, it's not worth the effort, and we should revert the breaking change by re-adding the missing return error.