Do not specify a max-line-length in the GitHub action

Author: kaste

.github/workflows/main.yml

@@ -22,4 +22,4 @@ jobs:
     - name: Lint with flake8
       run: |
         # stop the build if there are Python syntax errors or undefined names
-        flake8 . --count --max-line-length=100 --show-source --statistics
+        flake8 . --count --show-source --statistics