updating readme

README.rdoc

@@ -1,5 +1,7 @@
 = Nested Form
 
+This branch is for Rails 2 and no longer maintained. Instead use the {master branch}[https://github.com/ryanb/nested_form] with Rails 3.
+
 A Rails plugin to conveniently manage multiple nested models in a single form. It does so in an unobtrusive way through jQuery.
 
 This is in early development, so some of this documentation is not yet applicable.
@@ -8,7 +10,7 @@ This is in early development, so some of this documentation is not yet applicabl
 
 This is currently only available as a plugin.
 
-  script/plugin install git://github.com/ryanb/nested_form.git
+  script/plugin install git://github.com/ryanb/nested_form.git -r rails2
 
 
 == Usage
@@ -32,15 +34,6 @@ Use this form just like normal, including the fields_for helper method for nesti
 This generates links which dynamically add and remove fields.
 
 
-== Partials
-
-It is often desirable to move the nested fields into a partial to keep things organized. If you don't supply a block to fields_for it will look for a partial and use that.
-
-  <%= f.fields_for :tasks %>
-
-In this case it will look for a partial called "task_fields" and pass the form builder as an f variable to it.
-
-
 == Special Thanks
 
 This plugin is based on the solution by Tim Riley in his complex-form-examples fork.