Fix type error (array). Allows testsuite to run under PHP 7.1.x - Closes #2

src/whois.parser.php

@@ -338,7 +338,7 @@ if (!$items)
 				'Zone Email:' => 'zone.email'
 				);
 
-$r = '';
+$r = [];
 $disok = true;
 
 while (list($key,$val) = each($rawdata))
@@ -884,4 +884,4 @@ else
 
 return sprintf("%.4d-%02d-%02d",$res['y'],$res['m'],$res['d']);
 }
-?>
+?>