Update Redis commands link to redis.io.

README.md

@@ -103,7 +103,7 @@ Note that in either form the `callback` is optional:
     client.set("some key", "some val");
     client.set(["some other key", "some val"]);
 
-For a list of Redis commands, see [Redis Command Reference](http://code.google.com/p/redis/wiki/CommandReference)
+For a list of Redis commands, see [Redis Command Reference](http://redis.io/commands)
 
 The commands can be specified in uppercase or lowercase for convenience.  `client.get()` is the same as `client.GET()`.