note about versions in the README

Author: ryanflorence

CONTRIBUTING.md

@@ -11,6 +11,11 @@ following prefixes in your commit subject:
 That ensures the subject line of your commit makes it into the
 auto-generated changelog.
 
+### README
+
+Please update the readme with any API changes, the code and docs should
+always be in sync.
+
 ### Development
 
 - `script/test` will fire up a karma runner and watch for changes in the

README.md

@@ -5,6 +5,10 @@ React Router
 
 A complete routing library for React.
 
+You are viewing docs for the latest code on master. Check out
+[other releases](https://github.com/rpflorence/react-router/releases)
+for the version you have installed.
+
 Features
 --------