Add action to upload to pypi (#1)

.github/workflows/pypi.yml

@@ -0,0 +1,23 @@
+---
+name: Upload Python Package
+
+"on":
+  release:
+    types: [created]
+
+jobs:
+  upload:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/setup-python@v2
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install --upgrade setuptools wheel twine
+    - name: Build and publish
+      env:
+        TWINE_USERNAME: ${{ secrets.PYPI_USERNAME }}
+        TWINE_PASSWORD: ${{ secrets.PYPI_PASSWORD }}
+      run: |
+        python setup.py twine --commit --rebuild --egg=all --sdist=all