update appveyor

Author: Amin

.appveyor.yml

@@ -17,13 +17,9 @@ environment:
   ffmpeg_download: https://www.gyan.dev/ffmpeg/builds/packages/ffmpeg-5.0-essentials_build.zip
 
   matrix:
-    - PYTHON: "C:\\Python39"
-      PYTHON_VERSION: 3.8
-      PYTHON_ARCH: 32
-
-    - PYTHON: "C:\\Python38"
-      PYTHON_VERSION: 3.8
-      PYTHON_ARCH: 32
+    - TOXENV: py38
+    - TOXENV: py39
+    - TOXENV: py310
 
 init:
   - ECHO %PYTHON% %PYTHON_VERSION% %PYTHON_ARCH%