message: Update savegame version string
diff: @@ -46,7 +46,7 @@ namespace constants
  // = SAVE GAMES
  // =====================================
  const std::string SAVE_GAME_PATH = "savegames/";
  - const std::string SAVE_GAME_VERSION = "0.30";
  + const std::string SAVE_GAME_VERSION = "0.31";
  const std::string SAVE_GAME_ROOT_NODE = "OutpostHD_SaveGame";
  