~ changed missed nlohmann::json::iter_imp<nlohman::json> to nlohmann::json::iterator from PR #12

Signed-off-by: Alexis Maiquez <almamu@almamu.com>

src/WallpaperEngine/Core/Core.cpp

@@ -60,7 +60,7 @@ irr::video::SColor Core::atoSColor (const std::string& str)
     return Core::atoSColor (str.c_str ());
 }
 
-nlohmann::detail::iter_impl<nlohmann::json> Core::jsonFindRequired (nlohmann::json& data, const char *key, const char *notFoundMsg)
+nlohmann::json::iterator Core::jsonFindRequired (nlohmann::json& data, const char *key, const char *notFoundMsg)
 {
     auto value = data.find (key);
     if (value == data.end ())