(doc) Delete branch on merge

.asf.yaml

@@ -1,13 +1,13 @@
-# 
+#
 #  Licensed to the Apache Software Foundation (ASF) under one or more
 #  contributor license agreements.  See the NOTICE file distributed with
 #  this work for additional information regarding copyright ownership.
 #  The ASF licenses this file to You under the Apache License, Version 2.0
 #  (the "License"); you may not use this file except in compliance with
 #  the License.  You may obtain a copy of the License at
-# 
+#
 #       http://www.apache.org/licenses/LICENSE-2.0
-# 
+#
 #  Unless required by applicable law or agreed to in writing, software
 #  distributed under the License is distributed on an "AS IS" BASIS,
 #  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@@ -30,6 +30,8 @@ github:
     rebase: true
   autolink_jira:
     - MCLEAN
+  del_branch_on_merge: true
+
 notifications:
   commits: commits@maven.apache.org
   issues: issues@maven.apache.org