Add support to validate unicode email. (#326)

Author: kkevindev

src/Assert.php

@@ -801,7 +801,7 @@ public static function email(mixed $value, string $message = ''): string
     {
         static::string($value);
 
-        if (false === \filter_var($value, FILTER_VALIDATE_EMAIL)) {
+        if (false === \filter_var($value, FILTER_VALIDATE_EMAIL, FILTER_FLAG_EMAIL_UNICODE)) {
             static::reportInvalidArgument(\sprintf(
                 $message ?: 'Expected a value to be a valid e-mail address. Got: %s',
                 static::valueToString($value)

tests/AssertTest.php

@@ -597,6 +597,7 @@ public static function getTests(): array
             array('email', array(123), false),
             array('email', array('foo.com'), false),
             array('email', array('[email protected]'), true),
+            array('email', array('föö@bar.com'), true),
             array('uniqueValues', array(array('qwerty', 'qwerty')), false),
             array('uniqueValues', array(array('asdfg', 'qwerty')), true),
             array('uniqueValues', array(array(123, '123')), false),