Test GH actions to lint

Author: c24t

.github/workflows/lint.yml

@@ -0,0 +1,18 @@
+name: Lint
+
+on: [pull_request]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v1
+    - uses: actions/setup-python@v1
+      with:
+        python-version: '3.7'
+    - name: Install tox
+      run: pip install tox
+    - name: Run lint
+      run: tox -e lint