message: appveyor: fixed echo <empty variable>
diff: @@ -66,7 +66,7 @@ before_build:
  - validate_format_win.bat
  - cd c:\projects\DiligentCore
  - echo %PLATFORM%
  - - echo %cmake_args%
  + - echo.%cmake_args%
  - cmake %cmake_args% -S . -B ./build -G "Visual Studio 15 2017" -A %PLATFORM%
  build:
  