README.md in unidom-common-2.1.2 vs README.md in unidom-common-3.0

@@ -5,11 +5,11 @@
 
 [![Gem Version](https://badge.fury.io/rb/unidom-common.svg)](https://badge.fury.io/rb/unidom-common)
 [![Dependency Status](https://gemnasium.com/badges/github.com/topbitdu/unidom-common.svg)](https://gemnasium.com/github.com/topbitdu/unidom-common)
 
 Unidom (UNIfied Domain Object Model) is a series of domain model engines. The Common domain model engine includes the common models.
-Unidom (统一领域对象模型)是一系列的领域模型引擎。常用领域模型引擎包括一些常用的模型。
+Unidom （统一领域对象模型）是一系列的领域模型引擎。常用领域模型引擎包括一些常用的模型。
 
 
 
 ## Recent Update
 
@@ -132,11 +132,11 @@
 
 ## Exact Columns
 
 ```ruby
 # db/migrate/YYYYMMDDHHMMSS_create_people.rb
-class CreatePeople < ActiveRecord::Migration[5.0]
+class CreatePeople < ActiveRecord::Migration[6.0]
 
   def change
 
     create_table :people, id: :uuid do |t|
 
@@ -187,10 +187,10 @@
 
 ## Secure Column
 
 ```ruby
 # db/migrate/YYYYMMDDHHMMSS_create_orderings.rb
-class CreateOrderings < ActiveRecord::Migration[5.0]
+class CreateOrderings < ActiveRecord::Migration[6.0]
 
   def change
 
     create_table :orderings, id: :uuid do |t|