Add push events to permit params in system hooks

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/controllers/admin/hooks_controller.rb

@@ -39,6 +39,6 @@ class Admin::HooksController < Admin::ApplicationController
   end
 
   def hook_params
-    params.require(:hook).permit(:url, :enable_ssl_verification)
+    params.require(:hook).permit(:url, :enable_ssl_verification, :push_events, :tag_push_events)
   end
 end