Avoid short array syntax for php5.3 compatibility.

Author: İsmail BASKIN

src/ReCaptcha/Response.php

@@ -64,7 +64,7 @@ public static function fromJson($json)
         }
 
         if (isset($responseData['success']) && $responseData['success'] == true) {
-            return new Response(true, [], isset($responseData['hostname']) ? $responseData['hostname'] : '');
+            return new Response(true, array(), isset($responseData['hostname']) ? $responseData['hostname'] : '');
         }
 
         if (isset($responseData['error-codes']) && is_array($responseData['error-codes'])) {

tests/ReCaptcha/ResponseTest.php

@@ -58,7 +58,7 @@ public function testIsSuccess()
         $response = new Response(false);
         $this->assertFalse($response->isSuccess());
 
-        $response = new Response(true, [], 'example.com');
+        $response = new Response(true, array(), 'example.com');
         $this->assertEquals('example.com', $response->getHostName());
     }