DNS check should convert unicode domains first (#166)

* fix checkdnsrr not handling unicode domains properly

* fix for php7.2

EmailValidator/Validation/DNSCheckValidation.php

@@ -44,7 +44,7 @@ class DNSCheckValidation implements EmailValidation
 
     protected function checkDNS($host)
     {
-        $host = rtrim($host, '.') . '.';
+        $host = rtrim(idn_to_ascii($host, IDNA_DEFAULT, INTL_IDNA_VARIANT_UTS46), '.') . '.';
 
         $Aresult = true;
         $MXresult = checkdnsrr($host, 'MX');

Tests/EmailValidator/Validation/DNSCheckValidationTest.php

@@ -24,6 +24,9 @@ class DNSCheckValidationTest extends TestCase
             ['"Abc@def"@example.com'],
             ['"Fred\ Bloggs"@example.com'],
             ['"Joe.\\Blow"@example.com'],
+            
+            // unicide
+            ['ñandu.cl'],
         ];
     }