Update appveyor.yml

appveyor.yml

@@ -1,30 +1,19 @@
+image:
+  - Visual Studio 2019
 environment:
-
-  global:
-    # SDK v7.0 MSVC Express 2008's SetEnv.cmd script will fail if the
-    # /E:ON and /V:ON options are not enabled in the batch script intepreter
-    # See: http://stackoverflow.com/a/13751649/163740
-    WITH_COMPILER: "cmd /E:ON /V:ON /C .\\appveyor\\run_with_compiler.cmd"
-
   matrix:
-
-    - PYTHON: "C:\\Python37-x64"
-      PYTHON_VERSION: "3.7.x"
+    - PYTHON: "C:\\Python38-x64"
+      PYTHON_VERSION: "3.8.x"
       PYTHON_ARCH: "64"
-
 init:
   - "ECHO %PYTHON% %PYTHON_VERSION% %PYTHON_ARCH%"
 
 install:
   - git submodule update --init
   - "%PYTHON%\\python -m pip install --upgrade pip"
-  - "%PYTHON%\\Scripts\\pip install pymyinstall"
-  - "%PYTHON%\\Scripts\\pymy_install3 --set=pyquickhelper"
-  - "%PYTHON%\\Scripts\\pymy_install3 --task=tool --source=zip graphviz"
-  - "%PYTHON%\\Scripts\\pip install pyquickhelper --no-deps"
-  - "%PYTHON%\\Scripts\\pip install wcwidth backcall"
   - "%PYTHON%\\Scripts\\pip install -r requirements.txt"
-  - "set PATH=%PATH%;C:\\projects\\jyquickhelper\\build\\update_modules\\Graphviz\\bin"
+  - "%PYTHON%\\Scripts\\pip install pyquickhelper --no-deps -y"
+  - "%PYTHON%\\Scripts\\pip install wcwidth backcall"
   - set PYTHONPATH=src
 build: off