Add windows to the test matrix

.github/workflows/test.yaml

@@ -13,11 +13,15 @@ env:
 
 jobs:
   test:
-    runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
         py_version: ['2.7', '3.9', '3.11']
+        os: [ubuntu-latest, windows-latest]
+        exclude:
+          - os: windows-latest
+            py_version: '2.7'
+    runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout repository
         uses: actions/checkout@v3