Require PR (#2052)

Author: blaginin

.asf.yaml

@@ -50,3 +50,7 @@ github:
           - "test (beta)"
           - "test (nightly)"
           - "Release Audit Tool (RAT)"
+  pull_requests:
+    # enable updating head branches of pull requests
+    allow_update_branch: true
+    allow_auto_merge: true