Update python-app.yml

Author: ddkohler

.github/workflows/python-app.yml

@@ -14,9 +14,10 @@ permissions:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
     strategy:
       matrix:
+        os: [ubuntu-latest, windows-latest]
         python-version: [3.11, 3.12, 3.13]
     steps:
     - uses: actions/checkout@v4
@@ -28,7 +29,6 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         pip install flake8 pytest
-        if [[ -f requirements.txt ]]; then pip install -r requirements.txt; fi
         pip install .[iontof]
     - name: Lint with flake8
       run: |