dependabot.yml in asciidoctor-fb2-0.4.0

- old
+ new

@@ -4,5 +4,10 @@
 updates:
   - package-ecosystem: "bundler"
     directory: "/"
     schedule:
       interval: "daily"
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"