Merge pull request #26 from FrenchBully/fix/add-guzzle-client-options

added Guzzle options to prevent PHP fatal error

src/FcmClient.php

@@ -58,18 +58,22 @@ public static function create(string $apiToken, string $projectId): FcmClient
      *
      * @return array
      */
-    public function send(Request $request): array
+    public function send(Request $request, array $arguments): array
     {
+        $default = [
+            'json' => $request->getBody(),
+            'http_errors' => false
+        ];
+
+        $options = is_array($arguments) && isset($arguments) ? $arguments : $default;
         // Build guzzle api client.
         $client = $this->getGuzzleClient();
 
         // Generate request url.
         $url = $request->getUrl();
 
         // Create and send the request.
-        $response = $client->post($url, [
-            'json' => $request->getBody()
-        ]);
+        $response = $client->post($url, $options);
 
         // Decode the response body from json to a plain php array.
         $body = json_decode($response->getBody()->getContents(), true);