Update CI config

Add .flake8 config file Add black experimental long string processing

.github/workflows/linting.yaml

@@ -29,7 +29,7 @@ jobs:
       - name: Install tools
         run: |
           python -m pip install --upgrade pip
-          pip install flake8 pylint
+          pip install flake8==3.9.1 pylint==2.13.8
           #if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
       - name: Lint with flake8
         run: |