Update changelog for conditional GET utility methods

actionpack/CHANGELOG

@@ -7,8 +7,14 @@
 * Update Prototype to 1.6.0.2 #599 [Patrick Joyce]
 
 * Conditional GET utility methods.  [Jeremy Kemper]
-  * etag!([:admin, post, current_user]) sets the ETag response header and returns head(:not_modified) if it matches the If-None-Match request header.
-  * last_modified!(post.updated_at) sets Last-Modified and returns head(:not_modified) if it's no later than If-Modified-Since.
+    response.last_modified = @post.updated_at
+    response.etag = [:admin, @post, current_user]
+
+    if request.fresh?(response)
+      head :not_modified
+    else
+      # render ...
+    end
 
 * All 2xx requests are considered successful [Josh Peek]