CI: Add a job for MSVC

Author: mrkn

.github/workflows/windows.yml

@@ -28,7 +28,7 @@ jobs:
         python_architecture:
         - x64
         #include:
-        #- { os: windows-latest , ruby: mswin , python: 3.x , python_architecture: x64 }
+        - { os: windows-latest , ruby: mswin , python: 3.x , python_architecture: x64 }
         #- { os: windows-latest , ruby: mingw , python: 3.x , python_architecture: x64 }
 
     steps: