pylint have issues with python 3.9

Author: penguinolog

.github/workflows/pythonpackage.yml

@@ -26,7 +26,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v2
         with:
-          python-version: '3.x'
+          python-version: '3.8'
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip