updated the build matrix so builds don't fail...
diff --git a/appveyor.yml b/appveyor.yml
index fa5f965..83538dd 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -28,14 +28,15 @@
     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 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
   - IF "%gen%" == "MinGW Makefiles" 7z x x86_64-8.1.0-release-posix-seh-rt_v6-rev0.7z -oc:\mingw > nul
 
 build_script:
+  - cmake --version
   # workaround for CMake not wanting sh.exe on PATH for MinGW
   - IF "%gen%" == "MinGW Makefiles" set PATH=%PATH:C:\Program Files\Git\usr\bin;=%
   - IF "%gen%" == "MinGW Makefiles" set PATH=C:\mingw\mingw64\bin;%PATH%