Merge pull request #17 from brianfreytag/remove_dns_requirement

Change DNS validation to default to true instead of false

src/Egulias/EmailValidator/EmailValidator.php

@@ -86,7 +86,7 @@ public function isValid($email, $checkDNS = false, $strict = false)
             return false;
         }
 
-        $dns = false;
+        $dns = true;
         if ($checkDNS) {
             $dns = $this->checkDNS();
         }