Update Maven version and add a couple doc links

Author: puredanger

README.md

@@ -22,10 +22,20 @@ Latest release: 0.1.262.0-151b23-alpha
 <dependency>
   <groupId>org.clojure</groupId>
   <artifactId>core.async</artifactId>
-  <version>0.1.242.0-44b1e3-alpha</version>
+  <version>0.1.262.0-151b23-alpha</version>
 </dependency>
 ```
 
+## Documentation
+
+* [Rationale](http://clojure.com/blog/2013/06/28/clojure-core-async-channels.html)
+* [API docs](http://clojure.github.io/core.async/)
+* [Code walkthrough](https://github.com/clojure/core.async/blob/master/examples/walkthrough.clj)
+
+## Presentations
+
+* [Rich Hickey on core.async](http://www.infoq.com/presentations/clojure-core-async)
+* Tim Baldridge on go macro internals - [part 1](https://www.youtube.com/watch?v=R3PZMIwXN_g) [part 2](https://www.youtube.com/watch?v=SI7qtuuahhU)
 
 ## License