fix: add image to available content types

Author: avardugin

src/Services/SwaggerService.php

@@ -312,7 +312,8 @@ protected function saveExample($code, $content, $produce)
         $description = $this->getResponseDescription($code);
         $availableContentTypes = [
             'application',
-            'text'
+            'text',
+            'image',
         ];
         $explodedContentType = explode('/', $produce);