Setup deploy using tokens

Author: lmcinnes

.github/workflows/pythonpublish.yml

@@ -20,7 +20,7 @@ jobs:
         pip install scikit-learn cython
     - name: Build and publish
       env:
-        TWINE_USERNAME: ${{ secrets.PYPI_USERNAME }}
+        TWINE_USERNAME: __token__
         TWINE_PASSWORD: ${{ secrets.PYPI_PASSWORD }}
       run: |
         python setup.py sdist bdist_wheel