chore(exhook): bump version

apps/emqx_exhook/src/emqx_exhook.app.src

@@ -1,6 +1,6 @@
 {application, emqx_exhook,
  [{description, "EMQ X Extension for Hook"},
-  {vsn, "4.3.3"},
+  {vsn, "5.0.0"},
   {modules, []},
   {registered, []},
   {mod, {emqx_exhook_app, []}},

apps/emqx_exhook/src/emqx_exhook_app.erl

@@ -20,8 +20,6 @@
 
 -include("emqx_exhook.hrl").
 
--emqx_plugin(extension).
-
 -define(CNTER, emqx_exhook_counter).
 
 -export([ start/2