Update setup_osx.md

Nightcode 2.5.4 is the current version

Author: joberding

outline/setup_osx.md

@@ -106,7 +106,7 @@ After you set up Leiningen as above, run the `lein version` command. This should
 ## Install Nightcode
 
 Go to the [Nightcode releases site](http://github.com/oakes/Nightcode/releases).
-On the page there, you should see version numbers and links to download specific version of Nightcode, for example, Nightcode-2.1.0.jar.
+On the page there, you should see version numbers and links to download specific version of Nightcode, for example, Nightcode-2.5.4.jar.
 Click the link ending in `.jar` and you will download a file, `Nightcode-x.y.z.jar`.
 
 > Don't download platform specific binary releases.
@@ -121,7 +121,7 @@ Open a terminal and run the following commands:
 
 ```bash
 cd ~/Downloads/
-java -jar Nightcode-2.1.0.jar
+java -jar Nightcode-2.5.4.jar
 ```
 
 ![Nightcode](img/nightcode-startup.png)
@@ -268,4 +268,4 @@ your install and setup are all completed!
 
 If you want to know what the turtle (*a small triangle*) can do,
 see [Turtle App API](https://github.com/ClojureBridge/welcometoclojurebridge/blob/master/outline/TURTLE.md) and
-[How to Walk Turtles](https://github.com/ClojureBridge/welcometoclojurebridge/blob/master/outline/TURTLE-SAMPLES.md) for more information.
+[How to Walk Turtles](https://github.com/ClojureBridge/welcometoclojurebridge/blob/master/outline/TURTLE-SAMPLES.md) for more information.