Update version number and add JSON string escape

src/MultiDownloaderClient.php

@@ -125,6 +125,7 @@ class MultiDownloaderClient
      */
     public function htmlForm(): string
     {
+        $json_string = addslashes(json_encode($this->buildRequest()));
         ob_start();
         include __DIR__ . '/htmlForm.php';
         return ob_get_clean();