chg: improved build.

.github/workflows/python-package.yml

@@ -22,7 +22,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        python -m pip install tox
+        python -m pip install tox setuptools
         if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
         python setup.py install
     - name: Lint with tox