Issue-257: Fix PHP 7.3 compatibility issues. (#264)

src/Exception/UnclosedComment.php

@@ -5,5 +5,5 @@ namespace Egulias\EmailValidator\Exception;
 class UnclosedComment extends InvalidEmail
 {
     const CODE = 146;
-    const REASON = "No colosing comment token found";
+    const REASON = "No closing comment token found";
 }

src/Validation/DNSCheckValidation.php

@@ -97,10 +97,7 @@ class DNSCheckValidation implements EmailValidation
      */
     protected function checkDns($host)
     {
-        $variant = INTL_IDNA_VARIANT_2003;
-        if (defined('INTL_IDNA_VARIANT_UTS46')) {
-            $variant = INTL_IDNA_VARIANT_UTS46;
-        }
+        $variant = INTL_IDNA_VARIANT_UTS46;
 
         $host = rtrim(idn_to_ascii($host, IDNA_DEFAULT, $variant), '.') . '.';