Hook maximum allowed rating into the configuration

I wonder if max posts should be a setter in DanbooruService...

src/mainwindow.h

@@ -27,6 +27,7 @@
 #include <KSharedDataCache>
 #include <KImageCache>
 
+#include "libdanbooru/danboorupost.h"
 
 class QQuickWidget;
 
@@ -75,6 +76,7 @@ private:
     DanbooruService *m_service;
     DanbooruConnectWidget *m_connectWidget;
     KImageCache *m_cache;
+    static QHash<int, DanbooruPost::Rating> ratingMap;
 
 };
 } // namespace Danbooru