message: cmake on appveyor is still old...
diff: @@ -23,15 +23,13 @@ matrix:
  environment:
  matrix:
  -# - gen: "MinGW Makefiles"
  -# - gen: "Visual Studio 14 2015"
  -# APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
  -# - gen: "Visual Studio 15 2017"
  -# APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
  - - gen: "Visual Studio 16 2019"
  - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019 Preview
  - - gen: "Visual Studio 16 2019"
  - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
  + - gen: "MinGW Makefiles"
  + - gen: "Visual Studio 14 2015"
  + APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
  + - gen: "Visual Studio 15 2017"
  + APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
  +# - gen: "Visual Studio 16 2019"
  +# APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019 Preview
  install:
  - IF "%gen%" == "MinGW Makefiles" appveyor-retry appveyor DownloadFile http://downloads.sourceforge.net/mingw-w64/x86_64-8.1.0-release-posix-seh-rt_v6-rev0.7z
  