appveyor script adjustments

Author: osch

appveyor.yml

@@ -1,7 +1,6 @@
 version: 0.3.2.{build}
 
-os:
-- Windows Server 2012 R2
+image: Windows Server 2012 R2
 
 shallow_clone: true
 
@@ -23,9 +22,17 @@ cache:
  - c:\hererocks -> appveyor.yml
  - c:\external -> appveyor.yml
 
+
+
 install:
  - echo "Setup..."
- - set PATH=C:\Python27\Scripts;%LR_EXTERNAL%;%PATH%
+ - set PATH=C:\Python38\;C:\Python38\Scripts;%LR_EXTERNAL%;%PATH%
+ - where py
+ - py --version
+ - where python
+ - python --version
+ - where pip
+ - pip --version
  - if /I "%platform%"=="x86" set HR_TARGET=vs_32
  - if /I "%platform%"=="x64" set HR_TARGET=vs_64
  - if /I "%platform%"=="mingw" set HR_TARGET=mingw
@@ -35,10 +42,9 @@ install:
  mkdir "%LR_EXTERNAL%\lib" &&
  mkdir "%LR_EXTERNAL%\include"
  )
- - if not exist c:\hererocks (
- pip install hererocks &&
- hererocks c:\hererocks --%LUA% --target %HR_TARGET% -rlatest
- )
+ - python -m pip install --upgrade pip
+ - pip install git+https://github.com/luarocks/hererocks@0.25.0
+ - hererocks c:\hererocks --%LUA% --target %HR_TARGET% -rlatest
  - call c:\hererocks\bin\activate
 
 before_build: