Create github workflow to run tox

Author: amorison

.github/workflows/tox.yml

@@ -0,0 +1,31 @@
+name: tox CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      max-parallel: 4
+      matrix:
+        python-version: ['3.6', '3.7', '3.8', '3.9']
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Setup Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python }}
+      - name: Update pip
+        run: python3 -m pip install -U pip
+      - name: Install tox
+        run: python3 -m pip install tox
+      - name: Run tox
+        run: python3 -m tox