message: Testing cache theory on appveyor. Iterated version number
diff: -version: 0.4.{build}
  +version: 0.5.{build}
  image: Visual Studio 2017
  platform: x64
  @@ -19,6 +19,10 @@ branches:
  - master
  - develop
  +# preserve "3rd_party" directory in the root of build folder but will reset it if 3rd_party CMakeLists.txt is modified
  +cache:
  + - 3rd_party -> **3rd_party\CMakeLists.txt
  +
  configuration: Release
  shallow_clone: true
  clone_depth: 5
  