rm stomp

.gitmodules

@@ -13,6 +13,3 @@
 [submodule "plugins/emqttd_sockjs"]
 	path = plugins/emqttd_sockjs
 	url = https://github.com/emqtt/emqttd_sockjs.git
-[submodule "plugins/emqttd_stomp"]
-	path = plugins/emqttd_stomp
-	url = git@github.com:emqtt/emqttd_stomp.git