Add workflow for GitHub Actions

.github/workflows/main.yml

@@ -0,0 +1,25 @@
+name: Run all tests
+
+on: [push]
+
+jobs:
+  build:
+    runs-on: ubuntu-18.04
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: [2.7, 3.4, 3.5, 3.6, 3.7, 3.8]
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Show Python version
+      run: python -V
+
+    - name: Run the tests
+      run: python setup.py test -q