FIX fixed sanitizeUrl method

Author: enricodelazzari

src/Helper.php

@@ -33,8 +33,6 @@ public static function sanitizeUrl(?string $url): ?string
             return $url;
         }
 
-        $url = Str::lower($url);
-
         if (! Str::startsWith($url, ['http://', 'https://'])) {
             return "https://{$url}";
         }

tests/HelpersTest.php

@@ -59,10 +59,7 @@
     ['url' => null, 'result' => null],
     ['url' => 'https://test.test', 'result' => 'https://test.test'],
     ['url' => 'http://test.test', 'result' => 'http://test.test'],
-    ['url' => 'HTTPS://TEST.TEST', 'result' => 'https://test.test'],
-    ['url' => 'HTTP://TEST.TEST', 'result' => 'http://test.test'],
     ['url' => 'test.test', 'result' => 'https://test.test'],
-    ['url' => 'TEST.TEST', 'result' => 'https://test.test'],
 ]);
 
 it('is instance of types', function (mixed $value, mixed $types, bool $result) {