Adds GitHub Actions for running tests

.github/workflows/main.yml

@@ -0,0 +1,22 @@
+name: CI
+
+on: [push]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python: [ '2.7' ]
+    name: Python ${{ matrix.python }} tests
+    steps:
+      - uses: actions/checkout@master
+      - name: Setup python
+        uses: actions/setup-python@v1
+        with:
+          python-version: ${{ matrix.python }}
+          architecture: x64
+      - name: Running tox
+        run: |
+          python -m pip install tox
+          tox -e $(tox -ls | grep py$(echo ${{ matrix.python }} | sed 's/\.//') | sed ':1;N;s/\n/,/;t1')