fix Closure link

Author: swannodette

README.md

@@ -1,6 +1,6 @@
 ## What is ClojureScript? ##
 
-ClojureScript is a compiler for [Clojure](http://clojure.org) that targets JavaScript. It is designed to emit JavaScript code which is compatible with the advanced compilation mode of the [Google Closure](http://code.google.com/closure/) optimizing compiler.
+ClojureScript is a compiler for [Clojure](http://clojure.org) that targets JavaScript. It is designed to emit JavaScript code which is compatible with the advanced compilation mode of the [Google Closure](https://developers.google.com/closure/compiler/) optimizing compiler.
 
 ## Releases and dependency information ##