Update README

.github/workflows/markdown.yml

@@ -40,6 +40,7 @@ jobs:
           git commit -m "Add markdown changes" -a
 
       - name: Push changes
-        uses: ad-m/github-push-action
+        uses: ad-m/github-push-action@master
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
+          branch: ${{ github.head_ref }}

README.md

@@ -5,7 +5,7 @@ gantt
     title Test Diagram
 
     section Section
-    A task           :a1, 2014-01-01, 30d
+    A task           :a1, 2014-01-01, 30d 
     Another task     :after a1, 20d
 ```