windows testing

Author: jhavl

.github/workflows/pythonpackage.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-latest]
+        os: [windows-latest, ubuntu-latest, macos-latest]
         python-version: [3.6, 3.7, 3.8]
 
     steps: