Add GitHub Action for running tests.

.github/workflows/index.yml

@@ -0,0 +1,32 @@
+name: Build
+
+on:
+  push:
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version:
+          - 2.7
+          - 3.4
+          - 3.5
+          - 3.6
+          - 3.7
+          - 3.8
+          - 3.9
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install tox tox-gh-actions
+    - name: Run tests
+      run: |
+        tox

tox.ini

@@ -10,7 +10,7 @@ envlist =
 	flake8
 	isort
 
-[tox:travis]
+[gh-actions]
 2.7 = py27-django111
 3.4 = py34-django{111,20}
 3.5 = py35-django{111,20,21,22}