Modify the documentation note

Now the text works for both upcoming release and released gem versions.

Author: geekq

README.markdown

@@ -1,9 +1,8 @@
 [![Build Status](https://travis-ci.org/geekq/workflow.png?branch=master)](https://travis-ci.org/geekq/workflow) Tested with [different Ruby and Rails versions](https://travis-ci.org/geekq/workflow)
 
-Note: this documentation is for the upcomming release / current state of
-the workflow library. For the documentation on the latest rubygems
-release click on the "Documentation" link at
-http://rubygems.org/gems/workflow
+Note: you can find documentation for specific workflow rubygem versions at
+http://rubygems.org/gems/workflow: select a version (optional, default
+is latest release), click "Documentation" link.
 
 What is workflow?
 -----------------