Update pythonpackage.yml

Author: gaugup

.github/workflows/pythonpackage.yml

@@ -15,8 +15,8 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8, 3.9, "3.10"]
-        os: [ubuntu-latest, macos-latest]
+        python-version: [3.6, 3.7, 3.8, 3.9]
+        os: [ubuntu-latest, macos-latest, windows-latest]
 
     steps:
     - uses: actions/checkout@v2