Bugfix wrong header

Bugfix wrong header

Author: ad3n

src/Api/Client.php

@@ -234,8 +234,8 @@ public function delete($url, array $options = [])
         if ($token = $this->fetch('token')) {
             $this->bearer($token);
         }
-        $this->addHeader('Content-Type', 'application/ld+json');
-        $this->addHeader('Accept', 'application/ld+json');
+        $this->addHeader('Content-Type', 'application/json');
+        $this->addHeader('Accept', 'application/json');
 
         try {
             $response = $this->request->delete(sprintf('%s.json?%s', $this->getRealUrl($url), http_build_query(array_merge([$this->paramKey => $this->apiKey], $options))), [