Missing coverage package

.github/workflows/actions.yml

@@ -43,7 +43,7 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           pip install -e .
-          pip install -U flake8
+          pip install -U flake8 coverage
           pip install -U Django~=${{ matrix.django_version }}
 
       - name: Lint with flake8