README.mdown in association_callbacks-0.2.0 vs README.mdown in association_callbacks-0.2.1

@@ -9,24 +9,24 @@
 First, two simple `Article` and `Comment` models:
 
     class Article < ActiveRecord::Base
       has_many :comments
     end
-    
+
     class Comment < ActiveRecord::Base
       belongs_to :article
     end
 
 Then, you often need to denormalize `Comment` stuff into `Post` or vice versa.
 Here is the standard way to denormalize `last_comment_at` on posts:
 
     class Comment < ActiveRecord::Base
       belongs_to :article
-      
+
       after_create :update_post_last_comment_at
       after_destroy :update_post_last_comment_at
-      
+
       def update_post_last_comment_at
         post.update_attributes!(last_comment_at: post.comments.order('created_at').last.try(:created_at))
       end
     end
 
@@ -37,14 +37,14 @@
 
 Here is how to do it with `association_callabacks`:
 
     class Post < ActiveRecord::Base
       has_many :comments
-    
+
       after_create :update_last_comment_at, source: :comments
       after_destroy :update_last_comment_at, source: :comments
-      
+
       def update_last_comment_at
         update_attributes!(last_comment_at: comments.order('created_at').last.try(:created_at))
       end
     end
 
@@ -54,23 +54,23 @@
 Note that association callbacks methods can take associated record as
 argument, above code can be:
 
     class Post < ActiveRecord::Base
       has_many :comments
-      
+
       after_create :update_last_comment_at
-      
+
       def update_last_comment_at(comment)
         update_attributes!(last_comment_at: comment.created_at)
       end
     end
 
 Association callbacks can also be defined as block:
 
     class Post < ActiveRecord::Base
       has_many :comments
-      
+
       after_destroy source: :comments do |post|
         post.decrement!(:comments_count)
       end
     end
 
@@ -88,6 +88,6 @@
 Then, just run `bundle install`.
 
 ## Executing test suite
 
 This project is fully tested with [Rspec 2](http://github.com/rspec/rspec).
-Just run `bundle exec rake` (after a `bundle install`).
\ No newline at end of file
+Just run `bundle exec rake` (after a `bundle install`).