Update setup.py, LICENCE.txt, and add PyPi GitHub action. [cherry-pic…

…ked from @KillerBOSS2019]

.github/workflows/publish-to-test-pypi.yml

@@ -0,0 +1,42 @@
+
+name: Publish Python 🐍 distributions 📦 to PyPI and TestPyPI
+
+on: [push, release]
+
+jobs:
+  build-n-publish:
+    name: Build and publish Python 🐍 distributions 📦 to PyPI and TestPyPI
+    runs-on: ubuntu-18.04
+
+    steps:
+    - uses: actions/checkout@master
+    - name: Set up Python 3.8
+      uses: actions/setup-python@v1
+      with:
+        python-version: 3.8
+
+    - name: Install pypa/build
+      run: >-
+        python -m
+        pip install
+        build
+        --user
+    - name: Build a binary wheel and a source tarball
+      run: >-
+        python -m
+        build
+        --sdist
+        --wheel
+        --outdir dist/
+        .
+    - name: Publish distribution 📦 to Test PyPI
+      uses: pypa/gh-action-pypi-publish@master
+      with:
+        skip_existing: true
+        password: ${{ secrets.TEST_PYPI_API_TOKEN }}
+        repository_url: https://test.pypi.org/legacy/
+    - name: Publish distribution 📦 to PyPI
+      if: (github.event_name == 'push' && startsWith(github.ref, 'refs/tags')) || github.event_name == 'release'
+      uses: pypa/gh-action-pypi-publish@master
+      with:
+        password: ${{ secrets.PYPI_API_TOKEN }}