Extract flake8 config in setup.cfg

Now you can just run "flake8" when linting

.github/workflows/ci.yml

@@ -51,7 +51,7 @@ jobs:
         run: pip install -r requirements.txt
 
       - name: Run lint
-        run: flake8 --max-line-length 120
+        run: flake8
 
       - name: Run tests
         run: python testUpdateHostsFile.py

setup.cfg

@@ -0,0 +1,2 @@
+[flake8]
+max-line-length = 120