avoid compiler error

         c:\projects\pythonscript\pythonscript\src\shortcutdlg.cpp(96): error C2429: attribute 'fallthrough' requires compiler flag '/std:c++17' [C:\projects\pythonscript\PythonScript\project\PythonScript2010.vcxproj]

Author: chcg

PythonScript/src/ShortcutDlg.cpp

@@ -93,7 +93,7 @@ INT_PTR CALLBACK ShortcutDlg::run_dlgProc(UINT message, WPARAM wParam, LPARAM lP
 				case IDOK:
 					saveConfig();
 					MenuManager::getInstance()->reconfigure();
-					[[fallthrough]];
+					//not available before c++17 [[fallthrough]];
 					//lint -fallthrough
 
 				case IDCANCEL: