add code

_posts/2015-04-06-scroller.md

@@ -8,9 +8,10 @@ img: http://vallandingham.me/images/vis/scroll/scroller_twitter.png
 categories:
   - tutorial
 demo: http://vallandingham.me/scroll_demo/
+code: https://github.com/vlandham/scroll_demo
 ---
 
-**Update: This code has been updated to use D3v4. Please Enjoy!**
+**Update: This code has been updated to use D3v4. [Please Enjoy!](https://github.com/vlandham/scroll_demo)**
 
 A critical component of successful interactive visualizations is orienting the users to what they are looking at. In a multi-faceted data story, it can be useful to explicitly move a user through the different views of the data.
 
@@ -46,7 +47,7 @@ I’ve [created a demo](http://vallandingham.me/scroll_demo/) that attempts to e
 
 Specifically, it is a story around the frequency of filler words - “ah”, “um”, and “uh” - said during the talk. [Take a look](http://vallandingham.me/scroll_demo/), and then, lets get started with looking behind the curtain at how to build this.
 
-As usual, the [code is available on github](https://github.com/vlandham/scroll_demo).
+**As usual, the [code is available on github](https://github.com/vlandham/scroll_demo).**
 
 ## HTML and CSS Structure