update publishing script

Author: chfw

.github/workflows/pythonpublish.yml

@@ -16,5 +16,16 @@ jobs:
     steps:
       # retrieve your distributions here
       - uses: actions/checkout@v1
+      - name: Set up Python
+        uses: actions/setup-python@v1
+        with:
+          python-version: '3.x'
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install setuptools wheel twine
+      - name: Build
+        run: |
+          python setup.py sdist bdist_wheel
       - name: Publish package distributions to PyPI
         uses: pypa/gh-action-pypi-publish@release/v1