README.md in token_attr-0.1.0 vs README.md in token_attr-0.2.0

@@ -4,26 +4,26 @@
 
 ## Installation
 
 Add `token_attr` to your Gemfile:
 
-    gem 'token_attr', '~> 0.1.0'
+    gem 'token_attr', '~> 0.2.0'
 
 ## Usage
 
 ```
 class User < ActiveRecord::Base
-  include TokenAttr
+  include TokenAttr::Concern
   token_attr :token
 end
 
 user = User.new
 user.valid?
 user.token # => "b8bd30ff"
 ```
 
-The token is generated in a `before_validation` callback.
+The token is generated in a `before_validation` callback only if the it's `nil`.
 
 ### Options
 
 #### Length
 
@@ -46,13 +46,13 @@
 - `:numeric` - any number
 - `:alphanumeric` - any character or number
 - a string - a string of your choice of the characters you want to use
 
 ```
-token_attr :token, alphabet: :numeric # => "82051173"
-token_attr :token, alphabet: :alphabetic # => "xqnInSJa"
+token_attr :token, alphabet: :numeric      # => "82051173"
+token_attr :token, alphabet: :alphabetic   # => "xqnInSJa"
 token_attr :token, alphabet: :alphanumeric # => "61nD0lUo"
-token_attr :token, alphabet: "token" # => "ktnekoet"
+token_attr :token, alphabet: "token"       # => "ktnekoet"
 ```
 
 ## Contributing
 
 1. Fork it ( http://github.com/mbillard/token_attr/fork )