Is your feature request related to a problem? Please describe.

In earlier versions of this library it was possible to pass a single first parameter into the v1() and v4() methods which would result in the method returning a new Array instead of a string representation of UUID.

Apparently uuid@2.x already deprecated this API but it seemingly never got removed.

Describe the solution you'd like

We could either just remove the legacy interface or decorate it with deprecation warnings.