Using extend-exclude for flake8

Author: BethanyG

.github/workflows/main.yml

@@ -70,7 +70,7 @@ jobs:
       - name: Lint with flake8
         run: |
           # stop the build if there are Python syntax errors or undefined names
-          flake8 --extend-exclude ./test --count --select=E9,F63,F7,F82 --show-source --statistics
+          flake8 --extend-exclude ./test, ./python/exercises/concept, ./runner, ./python/bin, ./bin --count --select=E9,F63,F7,F82 --show-source --statistics
           # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
           flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics