change: remove notifications in .asf.yaml (#19)

diff --git a/.asf.yaml b/.asf.yaml
index 39cdcb7..c333bef 100644
--- a/.asf.yaml
+++ b/.asf.yaml
@@ -44,7 +44,7 @@
       merge:   false
       rebase:  false
 
-    notifications:
-      commits:      notifications@apisix.apache.org
-      issues:       notifications@apisix.apache.org
-      pullrequests: notifications@apisix.apache.org
+#    notifications:
+#      commits:      notifications@apisix.apache.org
+#      issues:       notifications@apisix.apache.org
+#      pullrequests: notifications@apisix.apache.org