[Breaking Change] opt.Skip returns error

💥 This release includes breaking changes as follows:

• Options.Skip(src path) function now returns (skip bool, err error)
  • If your Skip returns skip == true, we skip the src
  • If your Skip returns skip == false, we copy the src
  • If your Skip returns err != nil, we stop copying immediately.

See https://pkg.go.dev/github.com/otiai10/copy?tab=doc#Options for more information.