Merge pull request #84 from cclauss/patch-1

GitHub Action: Add Python 3.9

Author: lazka

.github/workflows/main.yml

@@ -10,7 +10,7 @@ jobs:
     strategy:
       matrix:
         os: [windows-latest]
-        python-version: [3.6, 3.7, 3.8]
+        python-version: [3.6, 3.7, 3.8, 3.9]
     steps:
     - uses: actions/checkout@v2
     - name: Set up Python ${{ matrix.python-version }}
@@ -23,4 +23,4 @@ jobs:
         pip install -e .
     - name: Run Tests
       run: |
-        python runtests.py
+        python runtests.py