message: Remove no longer needed toElement() call
  The for loop update ensures we only loop over Elements, rather than the
  more generic Node.
diff: @@ -118,7 +118,7 @@ std::vector<Planet::Attributes> parsePlanetAttributes()
  auto rootElement = xmlDocument.firstChildElement(rootElementName);
  for (const auto* node = rootElement->firstChildElement("Planet"); node; node = node->nextSiblingElement("Planet"))
  {
  - planetAttributes.push_back(parsePlanet(node->toElement()));
  + planetAttributes.push_back(parsePlanet(node));
  }
  return planetAttributes;
  