Fix isort command so that it has all required arguments (#8)

Author: pedropb

{{cookiecutter.repo_name}}/.github/workflows/test.yml

@@ -22,7 +22,7 @@ jobs:
           pip install pipenv
           pipenv install --deploy --dev
 
-      - run: pipenv run isort --recursive --diff
+      - run: pipenv run isort --recursive --diff .
       - run: pipenv run black --check .
       - run: pipenv run flake8
       - run: pipenv run mypy