Fixed a syntax error

Author: scchess

README.md

@@ -245,7 +245,7 @@ PushNotification.configure({
   // (optional) Called when the user fails to register for remote notifications. Typically occurs when APNS is having issues, or the device is a simulator. (iOS)
   onRegistrationError: function(err) {
     console.error(err.message, err);
-  }
+  },
 
   // IOS ONLY (optional): default: all - Permissions to register.
   permissions: {