Improved readme.

Author: ashleydavis

README.md

@@ -1,2 +1,5 @@
-# d3-animated-viz
-Example animated visualization from chapter 13 of Data Wrangling with JavaScript.
+# Data Wrangling with JavaScript / d3-animated-viz
+
+If you're a JavaScript developer, you already know that working with data is a big deal. Why let the Python and R coders get all the glory? JavaScript isn't just good at data visualization, you can move your entire data wrangling pipeline to JavaScript and work more effectively. [Data Wrangling with JavaScript](http://bit.ly/2t2cJu2) teaches you core data munging techniques in JavaScript, along with many libraries and tools that will make your data tasks even easier.
+
+This repository contains code the final code for a D3 visualization of space junk covered in Chapter 13 (*Advanced visualization with D3*) of [Data Wrangling with JavaScript](http://bit.ly/2t2cJu2).