change text to string for sale_audits migrate

.gitignore

@@ -28,6 +28,7 @@ capybara-*.html
 /public/uploads/*
 /public/swf/*
 /public/receipts/
+/public/orders_*
 /public/*.mp3
 /coverage/
 /spec/tmp/*

db/migrate/20170403174111_create_sale_audits.rb

@@ -9,7 +9,7 @@ class CreateSaleAudits < ActiveRecord::Migration[5.1]
       t.string :action_by, :null => false
       t.string :approved_by, :null => true
       t.datetime :approved_at, :null => true
-      t.text :remark, :index => true
+      t.string :remark, :index => true
       t.timestamps
     end
     add_index :sale_audits, [:sale_id, :action, :action_at, :remark]