Add IDN validation

[FGasper]

Would it be reasonable to add IDN validation to this library? (I’m not aware of a way to do this in JS yet …)

Thank you!

[tugrul]

@FGasper can you assist me about this issue.

I published a library to map IDNA flag of a unicode character. But there are several flags for several IDNA versions. Which flags should consider valid for each versions of IDNA tables.

Then I am able to integrate my library to punnycode to verify characters.

You can see my library from https:/tugrul/node-idna

Thanks