code: public function getDln($state_code = null, $min = 900000001, $max = 999999999)
  	{
  		$dln = new Entities\DriverLicense();
  
  		$dln->number		= rand($min, $max);
  		$dln->state			= !empty($state_code) ? $state_code : $this->getState();
  		$dln->expiration	= $this->getExpiration();
  		
  		return $dln;
  	}
docs: Returns a DLN object that contains a driver license number, state, and expiration
  
  @param null $state_code
  @param int $min
  @param int $max
  @return \joshmoody\Mock\Entities\DriverLicense