Merge pull request #1823 from apache/chandan/github-delete-branches

.asf.yaml: Delete branches when pull requests are merged
diff --git a/.asf.yaml b/.asf.yaml
index 7483a9a..120de7b 100644
--- a/.asf.yaml
+++ b/.asf.yaml
@@ -33,6 +33,9 @@
     # disable rebase button:
     rebase: false
 
+  # Close branches when pull requests are merged
+  del_branch_on_merge: true
+
   # Enable pages publishing
   ghp_branch: gh-pages
   ghp_path: /