Update php curl options

Author: ivanalemunioz

src/libs/Requests/Requests/Transport/cURL.php

@@ -342,7 +342,7 @@ protected function setup_handle($url, $headers, $data, $options) {
 				$data = '';
 			}
 			elseif (!is_string($data)) {
-				$data = http_build_query($data, null, '&');
+				$data = http_build_query($data, '', '&');
 			}
 		}