Update appveyor.yml

Author: sdpython

appveyor.yml

@@ -1,17 +1,10 @@
+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%"