Update validation.go

[lovegreen1321]

Changed

[Weldeasy]

Merge this bad boy!

[mikelolasagasti]

This breaks a test, as the new regexp accepts anything between 16 and 56:

https://github.com/s-rah/onionscan/blob/master/utils/validation_test.go#L29=

I think (^|\.)[a-z2-7]{16}\.onion$|(^|\.)[a-z2-7]{56}\.onion$ would be more correct, as matches either 16 or 56 length domain names.

[VityaSchel]

@s-rah