Set up Github Actions to check lint on PRs

.github/workflows/main.yaml

@@ -0,0 +1,23 @@
+name: Lint
+
+# Trigger the workflow on push or pull request
+on: [push, pull_request]
+
+jobs:
+  lint:
+    name: Check lint code with Black
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code into the Go module directory
+        uses: actions/checkout@v1
+
+      - name: Setup Python 3
+        uses: actions/setup-python@v1
+        with:
+          python-version: "3.x"
+
+      - name: Install Black
+        run: pip3 install black
+
+      - name: Check lint
+        run: black --check scraper