Update .asf.yaml (#2751)

Author: imbajin

.asf.yaml

@@ -17,12 +17,12 @@
 
 github:
   features:
-    # Enable issue management
     issues: true
     # Enable wiki for documentation
     wiki: true
     # Enable projects for project management boards
     projects: true
+    discussions: true
   description: A graph database that supports more than 100+ billion data, high performance and scalability (Include OLTP Engine & REST-API & Backends)
   homepage: https://hugegraph.apache.org
   del_branch_on_merge: true