Fix docs build

Author: codingjoe

.github/workflows/ci.yml

@@ -30,6 +30,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/setup-python@v2
+      - run: python -m pip install -U setuptools wheel
       - uses: actions/checkout@v2
       - run: sudo apt-get install -y gettext graphviz
       - run: python setup.py develop