Fix python version call [skip ci]

Author: Stefano Moia

.github/workflows/pythonpublish.yml

@@ -18,7 +18,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v1
         with:
-        python-version: 3.7
+            python-version: '3.7'
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
@@ -29,4 +29,4 @@ jobs:
           TWINE_PASSWORD: ${{ secrets.PYPI_PASSWORD }}
         run: |
           python -m python setup.py sdist bdist_wheel
-          python -m twine upload dist/*
+          python -m twine upload dist/*