Merge pull request #20 from yvolkan/master

Add: Default param to media attachments for iOS

Author: jmrieger

src/OneSignalClient.php

@@ -211,6 +211,7 @@ public function postNotification($data = [], $app_id = '')
             "adm_group_message"          => false,
             "ttl"                        => false,
             "priority"                   => false,
+            "ios_attachments"            => false,
 
         ];