升级通知增加model

app/models/system_update_notice.rb

@@ -0,0 +1,2 @@
+class SystemUpdateNotice < ApplicationRecord
+end

spec/models/system_update_notice_spec.rb

@@ -0,0 +1,5 @@
+require 'rails_helper'
+
+RSpec.describe SystemUpdateNotice, type: :model do
+  pending "add some examples to (or delete) #{__FILE__}"
+end