add endpoint on_sub

files/vernemq.conf

@@ -817,6 +817,9 @@ vmq_webhooks.webhook4.endpoint = http://localhost:41000/onpub
 vmq_webhooks.webhook5.hook = on_deliver
 vmq_webhooks.webhook5.endpoint = http://localhost:40000/ondeliver
 
+vmq_webhooks.webhook6.hook = on_unsubscribe
+vmq_webhooks.webhook6.endpoint = http://localhost:40000/onunsub
+
 ## Specify the address and port of the bridge to connect to. Several
 ## bridges can configured by using different bridge names (e.g. br0). If the
 ## connection supports SSL encryption bridge.ssl.<name> can be used.