Initial trial of Github actions

.github/workflows/test.yml

+name: Run tests
+on: push
+
+jobs:
+  test:
+    name: Run tests with tox
+    runs-on: ubuntu-18.04
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Run tox
+        uses: docker://python:3.6
+        run: tox -e py36