handle RSS feed, add CI

.github/workflows/test.yml

@@ -0,0 +1,15 @@
+name: Test
+
+on:
+  push:
+    paths:
+      - '**.go'
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+    - name: Test
+      run: make test