Allow maximum line length of 120 characters

Author: goggle

.github/workflows/flake8.yml

@@ -21,4 +21,4 @@ jobs:
         pip install flake8
         # stop the build if there are Python syntax errors or undefined names
         flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
-        flake8 .
+        flake8 --max-line-length 120 .