README.md in closure_tree-3.0.4 vs README.md in closure_tree-3.1.0

@@ -7,10 +7,16 @@
 
 See [Bill Karwin](http://karwin.blogspot.com/)'s excellent
 [Models for hierarchical data presentation](http://www.slideshare.net/billkarwin/models-for-hierarchical-data)
 for a description of different tree storage algorithms.
 
+Closure tree is [tested under every combination](https://secure.travis-ci.org/mceachen/closure_tree.png?branch=master) of
+
+* Ruby 1.8.7 and Ruby 1.9.3
+* The latest Rails 3.0, 3.1, and 3.2 branches, and
+* Using MySQL, Postgresql, and SQLite.
+
 ## Installation
 
 Note that closure_tree only supports Rails 3.0 and later, and has test coverage for MySQL, PostgreSQL, and SQLite.
 
 1.  Add this to your Gemfile: ```gem 'closure_tree'```
@@ -178,9 +184,13 @@
 class WhereTag < Tag ; end
 class WhatTag < Tag ; end
 ```
 
 ## Change log
+
+### 3.1.0
+
+* Switched to using ```has_many :though``` rather than ```has_and_belongs_to_many```
 
 ### 3.0.4
 
 * Merged [pull request](https://github.com/mceachen/closure_tree/pull/8) to fix ```.siblings``` and ```.self_and_siblings```
   (Thanks, [eljojo](https://github.com/eljojo)!)