Add github action for pypi release

.github/workflows/release.yml

@@ -0,0 +1,28 @@
+name: Release to PyPI
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  build:
+    name: Build dist & publish
+    runs-on: ubuntu-18.04
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: Set up Python
+      uses: actions/setup-python@v1
+      with:
+        python-version: '3.x'
+
+    - name: Install build dependencies & build
+      run: |
+        python -m pip install --upgrade pip
+        pip install setuptools wheel
+        python setup.py sdist bdist_wheel
+    - name: Publish package
+      uses: pypa/[email protected]
+      with:
+        user: __token__
+        password: ${{ secrets.PYPI_TOKEN }}