The README says GUDID can be gotten. But don't see any functionality in code.

**Is your feature request related to a problem? Please describe.**
The README says, the library can help get GUDID for a device, but don't see any mechanism for it.

**Describe the solution you'd like**
If GUDID can be detected, expose that in `Asset` structure.

**Describe alternatives you've considered**
None yet.
