README.md in gindex-0.3.0 vs README.md in gindex-0.4.0

@@ -1,9 +1,11 @@
 # g index
 
 :speedboat: Instant **concurrent** index migrations for Rails
 
+[![Build Status](https://github.com/ankane/gindex/workflows/build/badge.svg?branch=master)](https://github.com/ankane/gindex/actions)
+
 ## Installation
 
 Add this line to your application’s Gemfile:
 
 ```ruby
@@ -17,10 +19,10 @@
 ```
 
 generates:
 
 ```ruby
-class AddIndexOnEmailToUsers < ActiveRecord::Migration[6.1]
+class AddIndexOnEmailToUsers < ActiveRecord::Migration[7.0]
   disable_ddl_transaction!
 
   def change
     add_index :users, :email, algorithm: :concurrently
   end