Create publish to PyPI workflow (#70)

* Create publish to PyPI workflow

Github action to publish wheel and sdist to PyPI on a published release

* Fix lint

.github/workflows/publish-pypi.yml

@@ -0,0 +1,32 @@
+name: Publish to PyPI
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  build-and-publish:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout tag
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+          ref: ${{ github.event.release.tag_name }}
+
+      - name: Set up Python 3.7
+        uses: actions/setup-python@v1
+        with:
+          python-version: 3.7
+
+      - name: Install pypa/build
+        run: python -m pip install build --user
+
+      - name: Build wheel and source dist
+        run: python -m build --sdist --wheel --outdir dist/ .
+
+      - name: Publish to PyPI
+        uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          user: __token__
+          password: ${{ secrets.PYPI_API_TOKEN }}