add setuptools to requirements

.github/workflows/test.yml

@@ -37,7 +37,7 @@ jobs:
  - name: Install dependencies
  run: |
  python -m pip install --upgrade pip
- python -m pip install --upgrade tox tox-gh-actions
+ python -m pip install --upgrade tox tox-gh-actions setuptools
 
  - name: Tox tests
  run: |