Issue #89: try GitHub actions for Windows.

.github/workflows/test.yml

@@ -30,3 +30,26 @@ jobs:
     - name: Test with pytest
       run: |
         pytest -v
+  build:
+    runs-on: windows-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python 3.9
+      uses: actions/setup-python@v2
+      with:
+        python-version: 3.9
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install black flake8 pytest
+        pip install -r requirements.txt
+        pip install .
+    - name: Check code style with Black
+      run: |
+        black -l 80 --check map_machine tests
+    - name: Lint with Flake8
+      run: |
+        flake8 --max-line-length=80 --ignore=E203,W503
+    - name: Test with pytest
+      run: |
+        pytest -v