message: testing VS 2019 on appveyor
diff: @@ -23,13 +23,15 @@ 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: "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
  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
  