message: Add CMAKE_BUILD_TYPE into appveyor yaml matrix.
diff: @@ -3,9 +3,10 @@ version: '{build}'
  # https://www.appveyor.com/docs/build-environment/#build-worker-images
  image: Visual Studio 2017
  -configuration:
  - - Debug
  - - Release
  +environment:
  + matrix:
  + - CMAKE_BUILD_TYPE: Debug
  + - CMAKE_BUILD_TYPE: Release
  before_build:
  - cmake . -Bbuild -G "Visual Studio 15 2017 Win64"
  