docs: Update README.md

README.md

@@ -46,6 +46,21 @@ vimdoc.
 
 2. `README.md` gets converted to `./doc/${{ github.event.repository.name }}.txt` and auto-committed to the repo.
 
+Optional:
+
+Add the following to `./.github/dependabot.yml` to auto update your github action dependencies:
+
+```
+version: 2
+updates:
+  # Maintain dependencies for GitHub Actions
+  - package-ecosystem: github-actions
+    directory: "/"
+    schedule:
+      interval: weekly
+    open-pull-requests-limit: 10
+```
+
 # Usage
 
 ### Generating vimdoc using GitHub Actions